feat: expand gh actions

Author: zeidlitz

.github/workflows/release.yaml

@@ -7,16 +7,49 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        goarch: [amd64, arm64]
 
     steps:
       - name: Checkout
         uses: actions/checkout@v5
 
-      - name: Build
-        run: go build -o observer .
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: '1.24'
+
+      - name: Build binary
+        run: |
+          echo "Building for ${{ matrix.goarch }}"
+          GOOS=linux GOARCH=${{ matrix.goarch }} go build -o observer-${{ matrix.goarch }} .
+
+      - name: Package binary as tar.gz with release tag
+        run: |
+          TAG=${GITHUB_REF#refs/tags/}
+          tar -czf observer-${{ matrix.goarch }}-$TAG.tar.gz observer-${{ matrix.goarch }}
 
-      - name: Release
+      - name: Upload artifact
+        uses: actions/upload-artifact@v3
+        with:
+          name: observer-${{ matrix.goarch }}-${GITHUB_REF#refs/tags/}.tar.gz
+          path: observer-${{ matrix.goarch }}-${GITHUB_REF#refs/tags/}.tar.gz
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          path: .
+
+      - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
         if: github.ref_type == 'tag'
         with:
-          files: observer
+          files: |
+            observer-amd64-${GITHUB_REF#refs/tags/}.tar.gz
+            observer-arm64-${GITHUB_REF#refs/tags/}.tar.gz
+