cmd: strip out symbol table & DWARF debugging info

Signed-off-by: Feruzjon Muyassarov <[email protected]>

Author: fmuyassarov

Dockerfile

@@ -6,12 +6,13 @@ ARG BASE_IMAGE=gcr.io/distroless/static:nonroot@sha256:9ecc53c269509f63c69a26616
 FROM $BUILD_IMAGE AS builder
 
 WORKDIR /workspace
+ARG LDFLAGS=-s -w -extldflags=-static
 # Copy the Go Modules manifests
 COPY go.mod go.sum ./
 COPY api/go.mod api/go.sum api/
 # cache deps before building and copying source so that we don't need to re-download as much
 # and so that source changes don't invalidate our downloaded layer
-RUN go mod download -x
+RUN --mount=type=cache,target=/go/pkg/mod/ go mod download -x
 
 # Copy the go source
 COPY cmd/main.go cmd/main.go
@@ -20,19 +21,20 @@ COPY internal/ internal/
 COPY pkg/ pkg/
 
 # Build
-RUN CGO_ENABLED=0 go build -a -o manager cmd/main.go
+RUN CGO_ENABLED=0 go build -a -ldflags "${LDFLAGS}" \
+    -o manager cmd/main.go
 
 # Use distroless as minimal base image to package the manager binary
 FROM $BASE_IMAGE
 
 # image.version is set during image build by automation
-LABEL org.opencontainers.image.authors="[email protected]"
-LABEL org.opencontainers.image.description="Operator managing an Ironic deployment for Metal3"
-LABEL org.opencontainers.image.documentation="https://book.metal3.io/irso/introduction"
-LABEL org.opencontainers.image.licenses="Apache License 2.0"
-LABEL org.opencontainers.image.title="Ironic Standalone Operator"
-LABEL org.opencontainers.image.url="https://github.com/metal3-io/ironic-standalone-operator"
-LABEL org.opencontainers.image.vendor="Metal3-io"
+LABEL org.opencontainers.image.authors="[email protected]" \
+    org.opencontainers.image.description="Operator managing an Ironic deployment for Metal3" \
+    org.opencontainers.image.documentation="https://book.metal3.io/irso/introduction" \
+    org.opencontainers.image.licenses="Apache License 2.0" \
+    org.opencontainers.image.title="Ironic Standalone Operator" \
+    org.opencontainers.image.url="https://github.com/metal3-io/ironic-standalone-operator" \
+    org.opencontainers.image.vendor="Metal3-io"
 
 WORKDIR /
 COPY --from=builder /workspace/manager .

Makefile

@@ -158,6 +158,10 @@ run: manifests generate fmt vet ## Run a controller from your host.
 docker-build: test ## Build docker image with the manager.
 	docker build -t ${IMG} .
 
+.PHONY: docker-build-debug
+docker-build-debug: test ## Build docker image with the manager with debug info.
+	docker build --build-arg LDFLAGS="-extldflags=-static" -t ${IMG} .
+
 .PHONY: docker-push
 docker-push: ## Push docker image with the manager.
 	docker push ${IMG}