Add GitHub action to update ILVerify baselines via PR comments (#18578)

Author: Copilot

.github/workflows/commands.yml

@@ -14,7 +14,7 @@ permissions:
 jobs:
   cleanup_old_runs:
     if: github.event.schedule == '0 13 * * *'
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     permissions:
       actions: write
     env:
@@ -33,7 +33,7 @@ jobs:
 
   run_command:
     if: github.event.issue.pull_request != '' && contains(github.event.comment.body, '/run')
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - name: Extract command to run
       uses: actions/github-script@v3
@@ -76,30 +76,80 @@ jobs:
       if: steps.command-extractor.outputs.result == 'fantomas'
       id: fantomas
       run: dotnet fantomas . -r
-    - name: Process fantomas command
+    - name: Process xlf command
       if: steps.command-extractor.outputs.result == 'xlf'
       id: xlf
       run: dotnet build src/Compiler /t:UpdateXlf
+    - name: Post ilverify start comment
+      if: steps.command-extractor.outputs.result == 'ilverify'
+      uses: actions/github-script@v3
+      with:
+        script: |
+          const body = `Started to run ilverify baseline update`;
+          await github.issues.createComment({
+            issue_number: context.issue.number,
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            body: body
+          });
+
+    - name: Process ilverify command (Update ILVerify baselines)
+      if: steps.command-extractor.outputs.result == 'ilverify'
+      id: ilverify
+      env:
+        TEST_UPDATE_BSL: 1
+      run: |
+        # Run the ilverify script with TEST_UPDATE_BSL=1
+        pwsh tests/ILVerify/ilverify.ps1
+        
+        # Calculate the changes per file
+        echo "Checking for changes in baseline files..."
+        FILES_CHANGED=0
+        CHANGES_OUTPUT=""
+        
+        for file in tests/ILVerify/*.bsl; do
+          if git diff --quiet "$file"; then
+            continue
+          else
+            FILES_CHANGED=$((FILES_CHANGED + 1))
+            LINES_CHANGED=$(git diff --numstat "$file" | awk '{print $1 + $2}')
+            CHANGES_OUTPUT="${CHANGES_OUTPUT}${file}: ${LINES_CHANGED} lines changed\n"
+          fi
+        done
+        
+        if [ "$FILES_CHANGED" -eq 0 ]; then
+          echo "result=The ilverify command ran and did not modify any baseline." >> $GITHUB_OUTPUT
+        else
+          echo -e "result=The ilverify command ran and triggered the following number of changes per file:\n${CHANGES_OUTPUT}" >> $GITHUB_OUTPUT
+        fi
     - name: Commit and push changes
-      if: steps.fantomas.outcome == 'success' || steps.xlf.outcome == 'success'
+      if: steps.fantomas.outcome == 'success' || steps.xlf.outcome == 'success' || steps.ilverify.outcome == 'success'
       run: |
+        # Only commit if there are actual changes
+        if git diff --quiet; then
+          echo "No changes to commit, skipping."
+          exit 0
+        fi
+        
         git config --local user.name "github-actions[bot]"
         git config --local user.email "41898282+github-actions[bot]@users.noreply.github.com"
         git commit -a -m 'Automated command ran: ${{ steps.command-extractor.outputs.result }}
 
           Co-authored-by: ${{ github.event.comment.user.login }} <${{ github.event.comment.user.id }}+${{ github.event.comment.user.login }}@users.noreply.github.com>'
         git push
     - name: Post command comment
-      if: steps.fantomas.outcome == 'success' || steps.xlf.outcome == 'success'
+      if: steps.fantomas.outcome == 'success' || steps.xlf.outcome == 'success' || steps.ilverify.outcome == 'success'
       uses: actions/github-script@v3
       with:
         script: |
           // Probably, there's more universal way of getting outputs, but my gh-actions-fu is not that good.
           var output = ""
           if ("${{steps.command-extractor.outputs.result}}" == 'fantomas') {
             output = "${{steps.fantomas.outputs.result}}"
-          } else if("${{steps.command-extractor.outputs.result}}" == 'xlf') {
+          } else if ("${{steps.command-extractor.outputs.result}}" == 'xlf') {
             output = "${{steps.xlf.outputs.result}}"
+          } else if ("${{steps.command-extractor.outputs.result}}" == 'ilverify') {
+            output = "${{steps.ilverify.outputs.result}}"
           }
           const body = `Ran ${{ steps.command-extractor.outputs.result }}: https://github.com/${context.repo.owner}/${context.repo.repo}/actions/runs/${process.env.GITHUB_RUN_ID}\n${output}`;
           await github.issues.createComment({