Use Alpine as container image

Dockerfile

@@ -1,27 +1,30 @@
-# Build the manager binary
 FROM golang:1.13 as builder
 
 WORKDIR /workspace
-# Copy the Go Modules manifests
+
+# copy 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
+
+# cache modules
 RUN go mod download
 
-# Copy the go source
+# copy source code
 COPY main.go main.go
 COPY api/ api/
 COPY controllers/ controllers/
 
-# Build
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o manager main.go
+# build
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -a -o helm-controller main.go
+
+FROM alpine:3.12
+
+RUN apk add --no-cache ca-certificates tini
+
+COPY --from=builder /workspace/helm-controller /usr/local/bin/
+
+RUN addgroup -S controller && adduser -S -g controller controller
 
-# Use distroless as minimal base image to package the manager binary
-# Refer to https://github.com/GoogleContainerTools/distroless for more details
-FROM gcr.io/distroless/static:nonroot
-WORKDIR /
-COPY --from=builder /workspace/manager .
-USER nonroot:nonroot
+USER controller
 
-ENTRYPOINT ["/manager"]
+ENTRYPOINT [ "/sbin/tini", "--", "helm-controller" ]