Implement github action to build firmware

.github/workflows/build.yml

@@ -0,0 +1,119 @@
+name: OpenDTU Build
+
+on: [push, pull_request]
+
+jobs:
+  get_default_envs:
+    name: Gather Environments
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Cache pip
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: "3.x"
+
+      - name: Install PlatformIO
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade platformio
+
+      - name: Get default environments
+        id: envs
+        run: |
+          echo "::set-output name=environments::$(pio project config --json-output | jq -cr '.[0][1][0][1]')"
+
+    outputs:
+      environments: ${{ steps.envs.outputs.environments }}
+
+  build:
+    name: Build Enviornments
+    runs-on: ubuntu-latest
+    needs: get_default_envs
+    strategy:
+      matrix:
+        environment: ${{ fromJSON(needs.get_default_envs.outputs.environments) }}
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Cache pip
+        uses: actions/cache@v3
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+
+      - name: Cache PlatformIO
+        uses: actions/cache@v3
+        with:
+          path: ~/.platformio
+          key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.x"
+
+      - name: Install PlatformIO
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade platformio
+
+      - name: Setup Node.js and yarn
+        uses: actions/setup-node@v3
+        with:
+          node-version: "18"
+          cache: "yarn"
+          cache-dependency-path: "webapp/yarn.lock"
+
+      - name: Install WebApp dependencies
+        run: yarn --cwd webapp install --frozen-lockfile
+
+      - name: Build WebApp
+        run: yarn --cwd webapp build
+
+      - name: Build firmware
+        run: pio run -e ${{ matrix.environment }}
+
+      - name: Rename Firmware
+        run: mv .pio/build/${{ matrix.environment }}/firmware.bin .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.bin
+
+      - uses: actions/upload-artifact@v3
+        with:
+          name: opendtu-${{ matrix.environment }}
+          path: |
+            .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.bin
+
+      - uses: actions/upload-artifact@v3
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          name: opendtu-release
+          path: .pio/build/${{ matrix.environment }}/opendtu-${{ matrix.environment }}.bin
+
+  release:
+    name: Create Release
+    runs-on: ubuntu-latest
+    needs: [get_default_envs, build]
+    if: startsWith(github.ref, 'refs/tags/')
+    steps:
+      - uses: actions/download-artifact@v3
+        with:
+          name: opendtu-release
+
+      - name: Create draft release
+        uses: softprops/action-gh-release@v1
+        with:
+          draft: True
+          files: |
+            *.bin
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}