[SL-ONLY] Add require admin check workflow

.github/workflows/silabs-open-csa-pr.yaml

@@ -36,7 +36,8 @@ jobs:
 
                       **PR MUST BE MERGED WITH MERGE COMMIT - ADMIN MUST ENABLE THE OPTION**
                   token: ${{secrets.GITHUB_TOKEN}}
-                  labels: changing-submodules-on-purpose
+                  labels:
+                      changing-submodules-on-purpose, sl-require-admin-action
 
             # The next step is necessary to force the CI to be executed when a PR is opened by the github-bot.
             # The PR event isn't triggered when the bot opens the PR and as such doesn't trigger the workflows that use the event as their trigger.

.github/workflows/silabs-require-admin-action-check.yaml

@@ -0,0 +1,58 @@
+name: Check for sl-require-admin-action label
+
+on:
+    pull_request:
+        branches:
+            - main
+            - release_*
+        types:
+            - opened
+            - reopened
+            - synchronize
+            - labeled
+            - unlabeled
+
+permissions:
+    pull-requests: write
+
+jobs:
+    check-label:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Check for sl-require-admin-action label
+              run: |
+                  PR_NUMBER=${{ github.event.pull_request.number }}
+                  LABELS=$(gh pr view $PR_NUMBER --repo ${{ github.repository }} --json labels --jq '.labels[].name')
+                  if echo "$LABELS" | grep -q "sl-require-admin-action"; then
+                    echo "The sl-require-admin-action label is present. Failing the job."
+                    COMMENTS=$(gh pr view $PR_NUMBER --repo ${{ github.repository }} --json comments --jq '.comments[].body')
+                    if ! echo "$COMMENTS" | grep -q "The CI failure for this job is normal. An admin must do the merge."; then
+                      gh pr comment $PR_NUMBER --repo ${{ github.repository }} --body "The CI failure for this job is normal. An admin must do the merge."
+                    fi
+                    exit 1
+                  else
+                    echo "The sl-require-admin-action label is not present. Passing the job."
+                  fi
+              env:
+                  GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+
+    prevent-label-removal:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Prevent sl-require-admin-action label removal
+              if: github.event.action == 'unlabeled'
+              run: |
+                  PR_NUMBER=${{ github.event.pull_request.number }}
+                  REMOVED_LABEL=${{ github.event.label.name }}
+                  if [ "$REMOVED_LABEL" == "sl-require-admin-action" ]; then
+                    echo "The sl-require-admin-action label cannot be removed. Failing the job."
+                    COMMENTS=$(gh pr view $PR_NUMBER --repo ${{ github.repository }} --json comments --jq '.comments[].body')
+                    if ! echo "$COMMENTS" | grep -q "The sl-require-admin-action label cannot be removed once it has been added."; then
+                      gh pr comment $PR_NUMBER --repo ${{ github.repository }} --body "The sl-require-admin-action label cannot be removed once it has been added."
+                    fi
+                    exit 1
+                  else
+                    echo "A different label was removed. Passing the job."
+                  fi
+              env:
+                  GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}