workflows: lock Ubuntu runner to ubuntu-22.04

Lock the Ubuntu runner to ubuntu-22.04 to avoid accidental updates [1]
and increase reproducibility.

[1]: https://github.com/actions/runner-images/issues/10636

.github/workflows/backport.yml

@@ -14,7 +14,7 @@ jobs:
   backport:
     name: Backport Pull Request
     if: github.repository_owner == 'NixOS' && github.event.pull_request.merged == true && (github.event_name != 'labeled' || startsWith('backport', github.event.label.name))
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       # Use a GitHub App to create the PR so that CI gets triggered
       # The App is scoped to Repository > Contents and Pull Requests: write for Nixpkgs

.github/workflows/basic-eval.yml

@@ -16,7 +16,7 @@ permissions:
 jobs:
   tests:
     name: basic-eval-checks
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     # we don't limit this action to only NixOS repo since the checks are cheap and useful developer feedback
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.github/workflows/check-cherry-picks.yml

@@ -11,7 +11,7 @@ permissions: {}
 jobs:
   check:
     name: cherry-pick-check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: github.repository_owner == 'NixOS'
     steps:
     - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.github/workflows/check-maintainers-sorted.yaml

@@ -10,7 +10,7 @@ permissions:
 jobs:
   nixos:
     name: maintainer-list-check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.github/workflows/check-nix-format.yml

@@ -18,7 +18,7 @@ jobs:
 
   nixos:
     name: nixfmt-check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: get-merge-commit
     if: "needs.get-merge-commit.outputs.mergedSha && !contains(github.event.pull_request.title, '[skip treewide]')"
     steps:

.github/workflows/check-nixf-tidy.yml

@@ -9,7 +9,7 @@ permissions:
 jobs:
   nixos:
     name: exp-nixf-tidy-check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: "!contains(github.event.pull_request.title, '[skip treewide]')"
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.github/workflows/check-shell.yml

@@ -11,7 +11,7 @@ permissions: {}
 jobs:
   x86_64-linux:
     name: shell-check-x86_64-linux
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:

.github/workflows/codeowners-v2.yml

@@ -41,7 +41,7 @@ jobs:
   # Check that code owners is valid
   check:
     name: Check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: get-merge-commit
     if: needs.get-merge-commit.outputs.mergedSha
     steps:
@@ -88,7 +88,7 @@ jobs:
   # Request reviews from code owners
   request:
     name: Request
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - uses: cachix/install-nix-action@08dcb3a5e62fa31e2da3d490afc4176ef55ecd72 # v30
 

.github/workflows/editorconfig-v2.yml

@@ -16,7 +16,7 @@ jobs:
 
   tests:
     name: editorconfig-check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: get-merge-commit
     if: "needs.get-merge-commit.outputs.mergedSha && github.repository_owner == 'NixOS' && !contains(github.event.pull_request.title, '[skip treewide]')"
     steps:

.github/workflows/eval-lib-tests.yml

@@ -13,7 +13,7 @@ jobs:
 
   nixpkgs-lib-tests:
     name: nixpkgs-lib-tests
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: get-merge-commit
     if: needs.get-merge-commit.outputs.mergedSha
     steps:

.github/workflows/eval.yml

@@ -21,7 +21,7 @@ jobs:
 
   attrs:
     name: Attributes
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: get-merge-commit
     # Skip this and dependent steps if the PR can't be merged
     if: needs.get-merge-commit.outputs.mergedSha
@@ -60,7 +60,7 @@ jobs:
 
   eval-aliases:
     name: Eval nixpkgs with aliases enabled
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: [ attrs, get-merge-commit ]
     steps:
       - name: Check out the PR at the test merge commit
@@ -78,7 +78,7 @@ jobs:
 
   outpaths:
     name: Outpaths
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: [ attrs, get-merge-commit ]
     strategy:
       fail-fast: false
@@ -118,7 +118,7 @@ jobs:
 
   process:
     name: Process
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: [ outpaths, attrs, get-merge-commit ]
     outputs:
       baseRunId: ${{ steps.baseRunId.outputs.baseRunId }}
@@ -218,7 +218,7 @@ jobs:
   # Separate job to have a very tightly scoped PR write token
   tag:
     name: Tag
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: [ attrs, process ]
     if: needs.process.outputs.baseRunId
     permissions:

.github/workflows/get-merge-commit.yml

@@ -12,7 +12,7 @@ permissions: {}
 
 jobs:
   resolve-merge-commit:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     outputs:
       mergedSha: ${{ steps.merged.outputs.mergedSha }}
     steps:

.github/workflows/labels.yml

@@ -16,7 +16,7 @@ permissions:
 jobs:
   labels:
     name: label-pr
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: "github.repository_owner == 'NixOS' && !contains(github.event.pull_request.title, '[skip treewide]')"
     steps:
     - uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9 # v5.0.0

.github/workflows/manual-nixos-v2.yml

@@ -13,7 +13,7 @@ on:
 jobs:
   nixos:
     name: nixos-manual-build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.github/workflows/manual-nixpkgs-v2.yml

@@ -15,7 +15,7 @@ on:
 jobs:
   nixpkgs:
     name: nixpkgs-manual-build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: github.repository_owner == 'NixOS'
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

.github/workflows/nix-parse-v2.yml

@@ -16,7 +16,7 @@ jobs:
 
   tests:
     name: nix-files-parseable-check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: get-merge-commit
     if: "needs.get-merge-commit.outputs.mergedSha && github.repository_owner == 'NixOS' && !contains(github.event.pull_request.title, '[skip treewide]')"
     steps:

.github/workflows/nixpkgs-vet.yml

@@ -25,7 +25,7 @@ jobs:
   check:
     name: nixpkgs-vet
     # This needs to be x86_64-linux, because we depend on the tooling being pre-built in the GitHub releases.
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     # This should take 1 minute at most, but let's be generous. The default of 6 hours is definitely too long.
     timeout-minutes: 10
     needs: get-merge-commit

.github/workflows/no-channel.yml

@@ -13,7 +13,7 @@ permissions: {}
 jobs:
   fail:
     name: "This PR is is targeting a channel branch"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - run: |
         cat <<EOF

.github/workflows/periodic-merge-24h.yml

@@ -24,7 +24,7 @@ jobs:
       contents: write  # for devmasx/merge-branch to merge branches
       pull-requests: write  # for peter-evans/create-or-update-comment to create or update comment
     if: github.repository_owner == 'NixOS'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       # don't fail fast, so that all pairs are tried
       fail-fast: false

.github/workflows/periodic-merge-6h.yml

@@ -24,7 +24,7 @@ jobs:
       contents: write  # for devmasx/merge-branch to merge branches
       pull-requests: write  # for peter-evans/create-or-update-comment to create or update comment
     if: github.repository_owner == 'NixOS'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       # don't fail fast, so that all pairs are tried
       fail-fast: false

.github/workflows/periodic-merge-haskell-updates.yml

@@ -26,7 +26,7 @@ jobs:
       contents: write  # for devmasx/merge-branch to merge branches
       pull-requests: write  # for peter-evans/create-or-update-comment to create or update comment
     if: github.repository_owner == 'NixOS'
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     name: git merge-base master staging → haskell-updates
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2

ci/README.md

@@ -73,7 +73,7 @@ jobs:
 
   build:
     name: Build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     needs: get-merge-commit
     steps:
       - uses: actions/checkout@<VERSION>