Copy component code within separate layer

Author: avi-08

Dockerfile

@@ -11,37 +11,41 @@ ARG COMPONENT
 ARG GOPROXY_ARG
 ENV GOPROXY=${GOPROXY_ARG}
 WORKDIR /workspace
-COPY "$COMPONENT" "$COMPONENT"
+COPY "$COMPONENT"/go.* "$COMPONENT"/
 RUN --mount=type=cache,target=/go/pkg/mod \
     cd $COMPONENT && go mod download
 
+# Component code
+FROM base as component-base
+COPY "$COMPONENT" "$COMPONENT"
+
 # Linting
 FROM harbor-repo.vmware.com/dockerhub-proxy-cache/golangci/golangci-lint:v1.50 AS lint-base
-FROM base AS lint
+FROM component-base AS lint
 RUN --mount=from=lint-base,src=/usr/bin/golangci-lint,target=/usr/bin/golangci-lint \
     --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     --mount=type=cache,target=/root/.cache/golangci-lint \
     cd $COMPONENT && golangci-lint run --config /workspace/.golangci.yaml --timeout 10m0s ./...
 
-FROM base AS fmt
+FROM component-base AS fmt
 RUN --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     cd $COMPONENT && go fmt ./...
 
-FROM base AS vet
+FROM component-base AS vet
 RUN --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     cd $COMPONENT && go vet ./...
 
 # Testing
-FROM base AS test
+FROM component-base AS test
 RUN --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     cd $COMPONENT && mkdir /out && go test -v -coverprofile=/out/cover.out ./...
 
 # Build the manager binary
-FROM base as builder
+FROM component-base as builder
 ARG TARGETOS
 ARG TARGETARCH
 ARG LD_FLAGS