CI: Build examples in PRs only after adding label

Author: fhessel

.github/workflows/build-examples.yml renamed to .github/workflows/build-examples-master.yml

@@ -4,9 +4,6 @@ on:
   push:
     branches:
       - master
-  pull_request:
-    branches:
-      - master
 jobs:
   build-examples:
     strategy:

.github/workflows/build-examples-pr.yml

@@ -0,0 +1,54 @@
+name: Build Examples
+
+on:
+  pull_request:
+    types: [labeled]
+jobs:
+  build-examples:
+    strategy:
+      matrix:
+        example:
+          - Async-Server
+          - Authentication
+          - HTML-Forms
+          - HTTPS-and-HTTP
+          - Middleware
+          - Parameters
+          - Parameter-Validation
+          - Put-Post-Echo
+          - REST-API
+          - Self-Signed-Certificate
+          - Static-Page
+          - Websocket-Chat
+        board:
+          - wrover
+          - wroom
+    runs-on: ubuntu-latest
+    if: "contains( github.event.pull_request.labels.*.name, 'CI: Build Examples' )"
+    steps:
+    - name: Checkout codebase
+      uses: actions/checkout@f90c7b395dac7c5a277c1a6d93d5057c1cddb74e
+    - name: Set up Python
+      uses: actions/setup-python@9ac730844c47e52575257e93faf193c4530bc095
+      with:
+        python-version: '3.8'
+    - name: Install PlatformIO
+      run: |
+        python -m pip install --upgrade pip
+        pip install platformio
+    - name: Build example
+      run: ./extras/ci/scripts/build-example.sh ${{ matrix.board }} ${{ matrix.example }}
+  remove-label:
+    runs-on: ubuntu-latest
+    if: "contains( github.event.pull_request.labels.*.name, 'CI: Build Examples' )"
+    steps:
+    - name: Remove Label from PR
+      uses: octokit/request-action@57ec46afcc4c58c813af3afe67e57ced1ea9f165
+      with:
+        route: DELETE /repos/:repository/issues/:issue_number/labels/:name
+        repository: ${{ github.repository }}
+        issue_number: ${{ github.event.number }}
+        name: 'CI: Build Examples'
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+