chore(ci): move apidiff to GitHub Action (#6901)

.github/workflows/apidiff.yml

@@ -0,0 +1,83 @@
+---
+name: apidiff
+on:
+  pull_request:
+
+jobs:
+  scan_changes:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ref: main
+    - name: Get main commit
+      id: main
+      run: echo "hash=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
+    - uses: actions/checkout@v3
+    - name: Get changed directories
+      id: changed_dirs
+      # Ignore changes to the internal and root directories.
+      run: |
+        tree=$(git diff-tree --no-commit-id --name-only --diff-filter=DMR -r ${{ steps.main.outputs.hash }}..HEAD)
+        uniques=$(echo $tree | xargs -r -L1 dirname | uniq)
+        dirs=$(echo $uniques | grep -v -e 'internal' -e '\.' | cat)
+        if [ -z "$dirs" ]
+        then
+          echo "changed={\"changed\":[]}" >> $GITHUB_OUTPUT
+          echo "No changes worth diffing!"
+        else
+          for d in $dirs; do list=${list},\"${d}\"; done
+          echo "changed={\"changed\":[${list#,}]}" >> $GITHUB_OUTPUT
+        fi
+    outputs:
+      changed_dirs: ${{ steps.changed_dirs.outputs.changed }}
+  apidiff:
+    needs: scan_changes
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.pull_request.labels.*.name, 'breaking change allowed')"
+    continue-on-error: true
+    strategy:
+      matrix: ${{ fromJson(needs.scan_changes.outputs.changed_dirs) }}
+    steps:
+    - uses: actions/setup-go@v3
+      with:
+        go-version: '1.18.3'
+    - name: Install latest apidiff
+      run: go install golang.org/x/exp/cmd/apidiff@latest
+    - uses: actions/checkout@v3
+      with:
+        ref: main
+    - name: Baseline name
+      id: baseline
+      run: |
+        export CHANGED=${{ matrix.changed }}
+        echo pkg="${CHANGED//\//_}_pkg.main" >> $GITHUB_OUTPUT
+    - name: Create Go package baseline
+      run: cd ${{ matrix.changed }} && apidiff -w ${{ steps.baseline.outputs.pkg }} .
+    - name: Upload baseline package data
+      uses: actions/upload-artifact@v3
+      with:
+        name: ${{ steps.baseline.outputs.pkg }}
+        path: ${{ matrix.changed }}/${{ steps.baseline.outputs.pkg }}
+        retention-days: 1
+    - uses: actions/checkout@v3
+    - name: Download baseline package data
+      uses: actions/download-artifact@v3
+      with:
+        name: ${{ steps.baseline.outputs.pkg }}
+        path: ${{ matrix.changed }}
+    - name: Compare regenerated code to baseline
+      run: |
+        cd ${{ matrix.changed }} && apidiff -incompatible ${{ steps.baseline.outputs.pkg }} . > diff.txt
+        cat diff.txt && ! [ -s diff.txt ]
+    - name: Add breaking change label
+      if: ${{ failure() && !github.event.pull_request.head.repo.fork }}
+      uses: actions/github-script@v6
+      with:
+        script: |
+          github.rest.issues.addLabels({
+            issue_number: ${{ github.event.number }},
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            labels: ['breaking change']
+          })