Move unit testing to a separate workflow

Author: ivankravets

.github/workflows/examples.yml

@@ -46,6 +46,3 @@ jobs:
       - name: Build examples
         run: |
           pio run -d ${{ matrix.example }}
-      - name: Build unit tests
-        run: |
-          pio test -d "examples/espidf-hello-world" -e esp32dev --without-uploading --without-testing

.github/workflows/tests.yml

@@ -0,0 +1,30 @@
+name: "Unit Testing"
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        python-version: [3.7]
+        example:
+          - "examples/espidf-hello-world"
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: "recursive"
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -U https://github.com/platformio/platformio/archive/develop.zip
+          pio pkg install --global --platform symlink://.
+      - name: Build test
+        run: |
+          pio test -d ${{ matrix.example }} --without-uploading --without-testing