Post a comment on each performance check completing

(Or at least try to 😬)

.github/workflows/qemu-perf.yml

@@ -4,6 +4,10 @@ on:
   schedule:
     - cron: '2 1 * * *'
 
+  push:
+    branches:
+      - 'perf'
+
 jobs:
   build:
     name: Build
@@ -31,6 +35,9 @@ jobs:
     steps:
       - uses: actions/checkout@v1.0.0
 
+      - name: Log start time
+        run: touch /tmp/start
+
       - name: Register self-compiled qemu
         run: docker run --rm --privileged meedamian/simple-qemu:${{matrix.qemu}}-${{matrix.arch}} -p yes
 
@@ -59,3 +66,78 @@ jobs:
           docker run --rm  --entrypoint=uname  bitcoind  -a
           docker run --rm                      bitcoind  --version
 
+      - name: Calculate execution time
+        run: |
+          START=$(date -r /tmp/start +%s)
+          NOW=$(date +%s)
+
+          DIFF=$(( NOW - START ))
+
+          SEC=1
+          MIN=$(( 60 * SEC ))
+          HOUR=$(( 60 * MIN ))
+          DAY=$(( 24 * HOUR ))
+
+          secs=$(( DIFF % 60 ))
+          mins=$(( $(( DIFF / MIN )) % 60 ))
+          hours=$(( $(( DIFF / HOUR )) % 24 ))
+          days=$(( DIFF / DAY ))
+
+          OUT=""
+          if [[ "${days}" -ne "0" ]]; then
+            # Days-long jobs shouldn't happen, but 🤷🏻‍♂️
+            OUT="${days}d "
+          fi
+
+          OUT="${OUT}${hours}h:${mins}m:${secs}s"
+
+          mkdir -p stat
+
+          echo "${OUT}" > stat/${{matrix.qemu}}-${{matrix.arch}}
+
+      - name: Save execution time as an artifact
+        uses: actions/upload-artifact@v1.0.0
+        with:
+          name: stats
+          path: stat/
+
+  comment:
+    name: Report result
+    needs: build
+    runs-on: ubuntu-18.04
+    steps:
+      - name: Download perf stats
+        uses: actions/download-artifact@v1.0.0
+        with:
+          name: stats
+
+      - name: Aggregate results
+        run: |
+          touch ./all-stats
+
+          echo "| version | arm32v7 | arm64" >> ./all-stats
+          echo "|:-------:|--------:|-----:" >> ./all-stats
+
+          for ver in $(ls ./stats/* | awk -F/ '{print $NF}' | cut -d- -f1 | uniq); do
+            line="| **${ver}**"
+
+            line="${line} | $(cat ./stats/${ver}-arm32v7 | tr -d '\n')"
+            line="${line} | $(cat ./stats/${ver}-arm64 | tr -d '\n')"
+
+            echo "${line}" >> ./all-stats
+          done
+
+          cat ./all-stats
+
+          echo ::set-env name=RESULTS::"$(cat ./all-stats | sed -z 's/\n/\\n/g')"
+
+      - uses: actions/github-script@0.4.0
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            github.issues.createComment({
+              owner: 'lncm',
+              repo: 'docker-bitcoind',
+              issue_number: 9,
+              body: `Today's results:\n\n${process.env.RESULTS.replace(/\\n/g, '\n')}`
+            })