Add cross-platform binary builds and release workflow improvements

This commit introduces a new build job that compiles binaries for multiple platforms (Linux, macOS) and architectures (amd64, arm64). It also refactors the release process to download pre-built artifacts and simplify the release directory preparation. The workflow now uses matrix strategy for building binaries and downloads all artifacts for the final release, removing the previous manual build steps for each platform.

.github/workflows/release.yml

@@ -22,15 +22,35 @@ jobs:
       - name: Run tests
         run: make githubtests
 
-  # Then create release only if tests pass
-  create-release:
+  # Build binaries for each platform
+  build:
     needs: test
-    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            goos: linux
+            goarch: amd64
+            output_name: linux_amd64
+          - os: ubuntu-latest
+            goos: linux
+            goarch: arm64
+            output_name: linux_arm64
+            cross_compile: true
+          - os: macos-latest
+            goos: darwin
+            goarch: amd64
+            output_name: darwin_amd64
+          - os: macos-latest
+            goos: darwin
+            goarch: arm64
+            output_name: darwin_arm64
+
+    runs-on: ${{ matrix.os }}
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-        with:
-          fetch-depth: 0
 
       - name: Setup Go
         uses: actions/setup-go@v5
@@ -42,77 +62,61 @@ jobs:
         run: |
           TAG=${GITHUB_REF#refs/tags/Release_}
           echo "version=$TAG" >> $GITHUB_OUTPUT
-          echo "tag_name=Release_$TAG" >> $GITHUB_OUTPUT
 
-      - name: Build binaries for multiple platforms
+      - name: Install cross-compilation tools (Linux ARM64 only)
+        if: matrix.cross_compile
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y gcc-aarch64-linux-gnu
+
+      - name: Build binaries
         env:
+          GOOS: ${{ matrix.goos }}
+          GOARCH: ${{ matrix.goarch }}
+          CC: ${{ matrix.cross_compile && 'aarch64-linux-gnu-gcc' || '' }}
           VERSION: ${{ steps.get_version.outputs.version }}
+        run: |
+          make obitools
+          mkdir -p artifacts
+          cd build
+          for binary in *; do
+            tar -czf ../artifacts/${binary}_${VERSION}_${{ matrix.output_name }}.tar.gz ${binary}
+          done
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: binaries-${{ matrix.output_name }}
+          path: artifacts/*
+
+  # Create the release
+  create-release:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Extract version from tag
+        id: get_version
+        run: |
+          TAG=${GITHUB_REF#refs/tags/Release_}
+          echo "version=$TAG" >> $GITHUB_OUTPUT
+
+      - name: Download all artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: release-artifacts
+
+      - name: Prepare release directory
         run: |
           mkdir -p release
-
-          # Build for Linux AMD64
-          echo "Building for Linux AMD64..."
-          GOOS=linux GOARCH=amd64 make obitools
-          cd build
-          for binary in *; do
-            tar -czf ../release/${binary}_${VERSION}_linux_amd64.tar.gz ${binary}
-          done
-          cd ..
-          rm -rf build
-          
-
-          # Build for Linux ARM64
-          echo "Building for Linux ARM64..."
-          GOOS=linux GOARCH=arm64 make obitools
-          cd build
-          for binary in *; do
-            tar -czf ../release/${binary}_${VERSION}_linux_arm64.tar.gz ${binary}
-          done
-          cd ..
-          rm -rf build
-          
-
-          # Build for macOS AMD64 (Intel)
-          echo "Building for macOS AMD64..."
-          GOOS=darwin GOARCH=amd64 make obitools
-          cd build
-          for binary in *; do
-            tar -czf ../release/${binary}_${VERSION}_darwin_amd64.tar.gz ${binary}
-          done
-          cd ..
-          rm -rf build
-          
-
-          # Build for macOS ARM64 (Apple Silicon)
-          echo "Building for macOS ARM64..."
-          GOOS=darwin GOARCH=arm64 make obitools
-          cd build
-          for binary in *; do
-            tar -czf ../release/${binary}_${VERSION}_darwin_arm64.tar.gz ${binary}
-          done
-          cd ..
-          rm -rf build
-          
-
-          # Build for Windows AMD64
-          echo "Building for Windows AMD64..."
-          GOOS=windows GOARCH=amd64 make obitools
-          cd build
-          for binary in *; do
-            # Windows binaries have .exe extension
-            if [ -f "${binary}.exe" ]; then
-              zip ../release/${binary}_${VERSION}_windows_amd64.zip ${binary}.exe
-            else
-              zip ../release/${binary}_${VERSION}_windows_amd64.zip ${binary}
-            fi
-          done
-          cd ..
-
-          echo "Built archives:"
+          find release-artifacts -type f -name "*.tar.gz" -exec cp {} release/ \;
           ls -lh release/
 
       - name: Generate Release Notes
-        id: release_notes
         env:
           VERSION: ${{ steps.get_version.outputs.version }}
         run: |
@@ -157,11 +161,6 @@ jobs:
           echo "tar -xzf <tool>_${VERSION}_darwin_arm64.tar.gz" >> release_notes.md
           echo '```' >> release_notes.md
           echo "" >> release_notes.md
-          echo "### Windows (AMD64)" >> release_notes.md
-          echo '```powershell' >> release_notes.md
-          echo "Expand-Archive <tool>_${VERSION}_windows_amd64.zip" >> release_notes.md
-          echo '```' >> release_notes.md
-          echo "" >> release_notes.md
           echo "Available tools: Replace \`<tool>\` with one of the obitools commands." >> release_notes.md
 
       - name: Create GitHub Release