Update DockerFile

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.16 as builder
+FROM golang:1.15 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -12,11 +12,10 @@ RUN go mod download
 # Copy the go source
 COPY main.go main.go
 COPY api/ api/
-COPY controllers/ controllers/
 COPY pkg/ pkg/
 
 # Build
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build  -mod=mod -a -o manager main.go
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on go build -mod=mod -a -o manager main.go
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details