Add action to auto-label PRs with merge conflicts

.github/workflows/label_merge_conflicts.yml

@@ -0,0 +1,25 @@
+# This workflow checks open PRs for merge conflicts and labels them when conflicts are found
+name: Check for merge conflicts
+
+# Run whenever the "main" branch is updated
+# NOTE: This means merge conflicts are only checked for when a PR is merged to main.
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+      # See: https://github.com/mschilde/auto-label-merge-conflicts/
+      - name: Auto-label PRs with merge conflicts
+        uses: mschilde/auto-label-merge-conflicts@v2.0
+        # Add "merge conflict" label if a merge conflict is detected. Remove it when resolved.
+        # Note, the authentication token is created automatically
+        # See: https://docs.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token
+        with:
+          CONFLICT_LABEL_NAME: 'merge conflict'
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        # Ignore errors
+        continue-on-error: true