add gitea workflow

.gitea/workflows/release.yaml

@@ -0,0 +1,67 @@
+name: Build and Release Firmware
+
+on:
+  push:
+    tags:
+      - "v*"
+
+env:
+  TARGET: thumbv8m.main-none-eabihf
+
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Rust Toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ env.TARGET }}
+
+      - name: Install llvm-tools / objcopy
+        run: rustup component add llvm-tools-preview
+
+      - name: Build Firmware Binaries
+        run: |
+          cd firmware
+
+          # Define the target features for each variant
+          declare -A VARIANTS=(
+            ["cs4398"]="cs4398,hid"
+            ["ak4490"]="ak4490,hid"
+            ["evk"]="evk,hid"
+          )
+
+          mkdir -p ../dist
+
+          for name in "${!VARIANTS[@]}"; do
+            features="${VARIANTS[$name]}"
+            echo "Building variant: $name with features: $features"
+
+            # 1. Compile release binary
+            cargo build --release --target ${{ env.TARGET }} --no-default-features --features "$features"
+
+            # 2. Extract paths
+            ELF_PATH="../target/${{ env.TARGET }}/release/guac"
+            HEX_PATH="../target/${{ env.TARGET }}/release/guac-${name}.hex"
+            RENAMED_ELF="../target/${{ env.TARGET }}/release/guac-${name}.elf"
+
+            # 3. Create .hex file using llvm-objcopy from Rust tools
+            rust-objcopy -O ihex "$ELF_PATH" "$HEX_PATH"
+            cp "$ELF_PATH" "$RENAMED_ELF"
+
+            # 4. Package ELF and HEX into a target-specific ZIP
+            ZIP_NAME="guac-firmware-${name}.zip"
+            zip -j "../dist/${ZIP_NAME}" "$RENAMED_ELF" "$HEX_PATH"
+          done
+
+      - name: Create Gitea Release
+        uses: gitea/release-action@v1
+        with:
+          key: ${{ secrets.GITHUB_TOKEN }}
+          files: dist/*.zip
+          draft: false
+          prerelease: false