ci: cross-compile binaries in workflow instead of downloading from APK registry

.gitea/workflows/docker-build.yml

@@ -68,13 +68,23 @@ jobs:
             "${{ github.server_url }}/api/packages/${{ github.repository_owner }}/alpine/edge/main"
 
   build-and-push-docker:
-    needs: build-apk
     runs-on:
       - ubuntu-24.04
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
 
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: src/go.mod
+
+      - name: Cross-compile binaries
+        run: |
+          cd src
+          CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -trimpath -o ../out/amd64/ax .
+          CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -trimpath -o ../out/arm64/ax .
+
       - name: Login to Docker Registry
         uses: docker/login-action@v3
         with:
@@ -88,18 +98,10 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Extract version
-        id: version
-        run: |
-          VERSION=$(echo "${{ github.ref_name }}" | sed 's/^v//')
-          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
-
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
           context: .
           push: true
           platforms: linux/amd64,linux/arm64
-          build-args: |
-            VERSION=${{ steps.version.outputs.version }}
           tags: "g.eliaskohout.de/eliaskohout/axolotl-server:${{gitea.ref_name}},g.eliaskohout.de/eliaskohout/axolotl-server:latest"