feat(bot): auto-label config PRs (#1534)

.github/workflows/zwave-js-bot_pulls.yml

@@ -0,0 +1,58 @@
+name: 'Z-Wave Bot: Organize PRs'
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+
+jobs:
+  # Label configuration updates with "config"
+  config-label:
+    runs-on: [ubuntu-latest]
+    steps:
+
+    - name: Checkout code
+      uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.ref }}
+        fetch-depth: 0 # Fetch the history, or this action won't work
+
+    - name: Detect changes (git)
+      id: check-changes
+      run: |
+        # ===============================
+        # Detect changes using git
+        # ===============================
+
+        # Check if there were any config file changes
+        if ! git diff --name-only origin/${{ github.base_ref }}..HEAD | grep -E "packages\/config\/config\/(.*\/)?.+\.json" ; then
+          echo "🔸 No config file changes"
+          echo "::set-output name=changes::no"
+          exit 0
+        fi
+
+        # Check if there were changes except config files and .gitignore
+        if git diff --name-only origin/${{ github.base_ref }}..HEAD | grep -E -v "packages\/config\/config\/(.*\/)?.+\.json" | grep -v ".gitignore" ; then
+          echo "❌ Found non-config changes, aborting..."
+          echo "::set-output name=changes::other"
+          exit 0
+        else
+          echo "✔ Changes are limited to config files"
+          echo "::set-output name=changes::config"
+        fi
+
+    - uses: actions/github-script@v3
+      if: steps.check-changes.outputs.changes == 'config'
+      with:
+        github-token: ${{secrets.BOT_TOKEN}}
+        script: |
+          const options = {
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+          };
+
+          await github.issues.addLabels({
+            ...options,
+            issue_number: context.payload.pull_request.number,
+            labels: ['config ⚙']
+          });
+