add github actions

Author: retroelec

.github/workflows/build.yml

@@ -0,0 +1,53 @@
+name: build
+on: [push]
+
+jobs:
+  build-windows:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Build EXE with Docker
+        run: |
+          docker run --rm -v ${{ github.workspace }}:/build docker.io/retroelec42/sdl2-cross sh -c "
+            make -f windows/Makefile && \
+            cp /usr/lib/gcc/x86_64-w64-mingw32/12-posix/libstdc++-6.dll /build/windows/ && \
+            cp /usr/lib/gcc/x86_64-w64-mingw32/12-posix/libgcc_s_seh-1.dll /build/windows/ && \
+            cp /usr/x86_64-w64-mingw32/lib/libwinpthread-1.dll /build/windows/ && \
+            cp /opt/sdl2-windows/SDL2/x86_64-w64-mingw32/bin/SDL2.dll /build/windows/
+          "
+
+      - name: Upload Executable and DLLs
+        uses: actions/upload-artifact@v4
+        with:
+          name: windows-executable
+          path: |
+            windows/c64win.exe
+            windows/*.dll
+
+      - name: Create Release
+        if: startsWith(github.ref, 'refs/tags/')
+        uses: softprops/action-gh-release@v2
+        with:
+          files: windows/c64win.exe
+
+  build-esp32:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Build ESP32-S3 binaries with Docker
+        run: |
+          docker run --rm -v ${{ github.workspace }}:/workspace/T-HMI-C64 docker.io/retroelec42/arduino-cli-thmic64 \
+            compile --warnings all --fqbn esp32:esp32:esp32s3:CDCOnBoot=cdc,DFUOnBoot=dfu,FlashSize=16M,JTAGAdapter=builtin,PartitionScheme=huge_app,PSRAM=opi,DebugLevel=info \
+             --build-property "build.extra_flags=-DBOARD_T_HMI -DUSE_WEB_KEYBOARD" \
+             --build-path build T-HMI-C64.ino
+
+      - name: Upload ESP32 Binaries
+        uses: actions/upload-artifact@v4
+        with:
+          name: esp32-firmware
+          path: "build/T-HMI-C64.ino.merged.bin"
+