Merge pull request #3349 from montmanu/update-docker-path

add kustomize to PATH

kustomize.Dockerfile

@@ -3,7 +3,7 @@ FROM golang:alpine as builder
 ARG VERSION
 ARG COMMIT
 ARG DATE
-RUN mkdir /build 
+RUN mkdir /build
 ADD . /build/
 WORKDIR /build/kustomize
 RUN CGO_ENABLED=0 GO111MODULE=on go build \
@@ -17,4 +17,5 @@ FROM alpine
 RUN apk add git openssh
 COPY --from=builder /build/kustomize /app/
 WORKDIR /app
+ENV PATH "$PATH:/app"
 ENTRYPOINT ["/app/kustomize"]