feat: add multi-arch Docker image builds (amd64 + arm64)

Build all images for linux/amd64 and linux/arm64 using Docker Buildx
and QEMU. Compile sidecar binary for both architectures and select the
correct one via TARGETARCH in agent Dockerfiles. Bump version to 0.2.1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: barckcode

.github/workflows/release.yml

@@ -36,7 +36,13 @@ jobs:
         run: go test -race ./...
 
       - name: Build sidecar binary for Linux amd64
-        run: CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -trimpath -o bin/sidecar-linux ./cmd/sidecar
+        run: CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags="-s -w" -trimpath -o bin/sidecar-linux-amd64 ./cmd/sidecar
+
+      - name: Build sidecar binary for Linux arm64
+        run: CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags="-s -w" -trimpath -o bin/sidecar-linux-arm64 ./cmd/sidecar
+
+      - name: Set up QEMU for multi-arch builds
+        uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -53,6 +59,7 @@ jobs:
         with:
           context: .
           file: build/api/Dockerfile
+          platforms: linux/amd64,linux/arm64
           push: true
           provenance: false
           tags: |
@@ -65,14 +72,17 @@ jobs:
 
       - name: Prepare agent build contexts
         run: |
-          cp bin/sidecar-linux build/agent/sidecar
-          cp bin/sidecar-linux build/opencode-agent/sidecar
+          cp bin/sidecar-linux-amd64 build/agent/sidecar-amd64
+          cp bin/sidecar-linux-arm64 build/agent/sidecar-arm64
+          cp bin/sidecar-linux-amd64 build/opencode-agent/sidecar-amd64
+          cp bin/sidecar-linux-arm64 build/opencode-agent/sidecar-arm64
 
       - name: Build and push Agent image
         uses: docker/build-push-action@v6
         with:
           context: build/agent
           file: build/agent/Dockerfile
+          platforms: linux/amd64,linux/arm64
           push: true
           provenance: false
           tags: |
@@ -88,6 +98,7 @@ jobs:
         with:
           context: build/opencode-agent
           file: build/opencode-agent/Dockerfile
+          platforms: linux/amd64,linux/arm64
           push: true
           provenance: false
           tags: |

.gitignore

@@ -40,3 +40,7 @@ Thumbs.db
 
 # Build artifacts
 dist/
+
+# Sidecar binaries copied into build contexts
+build/agent/sidecar-*
+build/opencode-agent/sidecar-*

Makefile

@@ -17,7 +17,7 @@ build-sidecar:
 	go build -o $(BIN_DIR)/sidecar ./cmd/sidecar
 
 build-sidecar-linux:
-	GOOS=linux GOARCH=$(DOCKER_ARCH) go build -o $(BIN_DIR)/sidecar-linux ./cmd/sidecar
+	GOOS=linux GOARCH=$(DOCKER_ARCH) go build -o $(BIN_DIR)/sidecar-linux-$(DOCKER_ARCH) ./cmd/sidecar
 
 build-all: build-api build-sidecar
 
@@ -35,14 +35,14 @@ build-api-image:
 	docker build -t agentcrew-api:$(IMAGE_TAG) -f build/api/Dockerfile .
 
 build-agent-image: build-sidecar-linux
-	cp $(BIN_DIR)/sidecar-linux build/agent/sidecar
+	cp $(BIN_DIR)/sidecar-linux-$(DOCKER_ARCH) build/agent/sidecar-$(DOCKER_ARCH)
 	docker build -t agentcrew-agent:$(IMAGE_TAG) -f build/agent/Dockerfile build/agent
-	rm -f build/agent/sidecar $(BIN_DIR)/sidecar-linux
+	rm -f build/agent/sidecar-$(DOCKER_ARCH) $(BIN_DIR)/sidecar-linux-$(DOCKER_ARCH)
 
 build-opencode-agent-image: build-sidecar-linux
-	cp $(BIN_DIR)/sidecar-linux build/opencode-agent/sidecar
+	cp $(BIN_DIR)/sidecar-linux-$(DOCKER_ARCH) build/opencode-agent/sidecar-$(DOCKER_ARCH)
 	docker build -t agentcrew-opencode-agent:$(IMAGE_TAG) -f build/opencode-agent/Dockerfile build/opencode-agent
-	rm -f build/opencode-agent/sidecar $(BIN_DIR)/sidecar-linux
+	rm -f build/opencode-agent/sidecar-$(DOCKER_ARCH) $(BIN_DIR)/sidecar-linux-$(DOCKER_ARCH)
 
 build-images: build-api-image build-agent-image build-opencode-agent-image
 
@@ -70,4 +70,4 @@ lint:
 clean:
 	rm -rf $(BIN_DIR)
 	go clean -testcache
-	rm -f build/agent/sidecar build/opencode-agent/sidecar
+	rm -f build/agent/sidecar-* build/opencode-agent/sidecar-*

VERSION

@@ -1 +1 @@
-0.2.0
+0.2.1

build/agent/Dockerfile

@@ -15,8 +15,9 @@ RUN npm install -g @anthropic-ai/claude-code skills
 # Create non-root user for running the agent
 RUN groupadd -r agentcrew && useradd -r -g agentcrew -m agentcrew
 
-# Copy the sidecar binary (built externally with Go)
-COPY sidecar /usr/local/bin/agent-sidecar
+# Copy the sidecar binary for the target architecture (built externally with Go)
+ARG TARGETARCH
+COPY sidecar-${TARGETARCH} /usr/local/bin/agent-sidecar
 RUN chmod +x /usr/local/bin/agent-sidecar
 
 # Create workspace directory for agent operations

build/opencode-agent/Dockerfile

@@ -15,8 +15,9 @@ RUN npm install -g opencode-ai skills
 # Create non-root user for running the agent
 RUN groupadd -r agentcrew && useradd -r -g agentcrew -m agentcrew
 
-# Copy the sidecar binary (built externally with Go)
-COPY sidecar /usr/local/bin/agent-sidecar
+# Copy the sidecar binary for the target architecture (built externally with Go)
+ARG TARGETARCH
+COPY sidecar-${TARGETARCH} /usr/local/bin/agent-sidecar
 RUN chmod +x /usr/local/bin/agent-sidecar
 
 # Create workspace directory for agent operations