build: add Containfile.sidecar and Makefile build cmds

Signed-off-by: Rakshith R <rar@redhat.com>

Author: Rakshith-R

Makefile

@@ -1,6 +1,8 @@
 
 # Image URL to use all building/pushing image targets
 IMG ?= controller:latest
+SIDECAR_IMG ?= quay.io/csiaddons/k8s-sidecar
+TAG?= latest
 # ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.
 ENVTEST_K8S_VERSION = 1.23
 
@@ -77,6 +79,14 @@ docker-build: test ## Build docker image with the manager.
 docker-push: ## Push docker image with the manager.
 	docker push ${IMG}
 
+.PHONY: docker-build-sidecar
+docker-build-sidecar:
+	docker build -f ./build/Containerfile.sidecar -t ${SIDECAR_IMG}:${TAG} .
+
+.PHONY: docker-push-sidecar
+docker-push-sidecar:
+	docker push ${SIDECAR_IMG}:${TAG}
+
 ##@ Deployment
 
 ifndef ignore-not-found

build/Containerfile.sidecar

@@ -0,0 +1,26 @@
+# Build the sidecar binary
+FROM golang:1.17 as builder
+
+WORKDIR /workspace
+# Copy the Go Modules manifests
+COPY go.mod go.mod
+COPY go.sum go.sum
+# 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
+
+# Copy the go source
+COPY sidecar/ sidecar/
+COPY api/ api/
+COPY internal/ internal/
+
+# Build
+RUN CGO_ENABLED=0 GOOS=linux go build -a -o csi-addons-sidecar sidecar/main.go
+
+# Use distroless as minimal base image to package the sidecar binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/static:latest
+WORKDIR /
+COPY --from=builder /workspace/csi-addons-sidecar /usr/bin/
+
+ENTRYPOINT ["/usr/bin/csi-addons-sidecar"]