automated build+release on tag action

.github/workflows/version_pio_build.yml

@@ -0,0 +1,46 @@
+name: "Build firmware and add release on tag v*"
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install pyhon
+        uses: actions/setup-python@v2
+
+      - name: Install pio
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade platformio
+
+      - name: Build noserial
+        run: pio run --project-dir ./Code --environment attiny841_noserial
+
+      - name: Rename noserial firmware
+        run: |
+          mv ./Code/.pio/build/attiny841_noserial/firmware.hex ./Code/.pio/build/attiny841_noserial/megadesk-$GITHUB_REF_NAME.hex
+          FILENAME=./Code/.pio/build/attiny841_noserial/megadesk-$GITHUB_REF_NAME.hex
+          echo "FILENAME=$FILENAME" >> $GITHUB_ENV
+
+      - name: Build serial
+        run: pio run --project-dir ./Code --environment attiny841_serial
+
+      - name: Rename serial firmware
+        run: |
+          mv ./Code/.pio/build/attiny841_serial/firmware.hex ./Code/.pio/build/attiny841_serial/megadesk-$GITHUB_REF_NAME-serial.hex
+          SFILENAME=./Code/.pio/build/attiny841_serial/megadesk-$GITHUB_REF_NAME-serial.hex
+          echo "SFILENAME=$SFILENAME" >> $GITHUB_ENV
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            ${{ env.FILENAME }}
+            ${{ env.SFILENAME }}
+