[github] Add publish workflow

.github/workflows/platformio-publish.yml

@@ -0,0 +1,46 @@
+name: PlatformIO Publish
+
+on:
+  push:
+    tags:
+      - v*.*.*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Cache pip
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+      - name: Cache PlatformIO
+        uses: actions/cache@v2
+        with:
+          path: ~/.platformio
+          key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+      - name: Set up Python
+        uses: actions/setup-python@v2
+      - name: Install PlatformIO
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade platformio
+      - name: Publish PlatformIO package
+        run: pio package publish
+        env:
+          CI: true
+          PLATFORMIO_AUTH_TOKEN: ${{ secrets.PLATFORMIO_AUTH_TOKEN }}
+      - name: Get latest version
+        id: get_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+      - name: Release on GitHub
+        uses: softprops/action-gh-release@v1
+        with:
+          name: ${{ steps.get_version.outputs.VERSION }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}