Branch was updated using the 'autoupdate branch' Actions workflow.

.github/workflows/repo-sync.yml

@@ -70,6 +70,33 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           number: ${{ steps.find-pull-request.outputs.number }}
 
+      # There are cases where the branch becomes out-of-date in between the time this workflow began and when the pull request is created/updated
+      - name: Update branch
+        uses: actions/github-script@626af12fe9a53dc2972b48385e7fe7dec79145c9
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          script: |
+            const mainHeadSha = await github.git.getRef({
+              ...context.repo,
+              ref: 'heads/main'
+            })
+            console.log(`heads/main sha: ${mainHeadSha.data.object.sha}`)
+
+            const pull = await github.pulls.get({
+              ...context.repo,
+              pull_number: ${{ steps.find-pull-request.outputs.number }}
+            })
+
+            if (mainHeadSha.data.object.sha !== pull.data.base.sha) {
+              const updateBranch = await github.pulls.updateBranch({
+                ...context.repo,
+                pull_number: ${{ steps.find-pull-request.outputs.number }}
+              })
+              console.log(updateBranch.data.message)
+            } else {
+              console.log(`Branch is already up-to-date`)
+            }
+
       - name: Send Slack notification if workflow fails
         uses: someimportantcompany/github-actions-slack-message@0b470c14b39da4260ed9e3f9a4f1298a74ccdefd
         if: failure()