adjust helloworld dockerfile

Author: reggeenr

helloworld/Dockerfile

@@ -1,10 +1,8 @@
-FROM icr.io/codeengine/golang:alpine
-RUN apk -U upgrade
-COPY helloworld.go /
-RUN go build -ldflags '-s -w -extldflags "-static"' -o /helloworld /helloworld.go
+FROM quay.io/app-sre/ubi8-go-toolset AS build-env
+COPY helloworld.go .
+RUN CGO_ENABLED=0 go build -o /opt/app-root/src/app helloworld.go
 
 # Copy the exe into a smaller base image
-FROM icr.io/codeengine/alpine
-RUN apk -U upgrade
-COPY --from=0 /helloworld /helloworld
-CMD /helloworld
+FROM registry.access.redhat.com/ubi9-minimal:latest
+COPY --from=build-env /opt/app-root/src/app /
+CMD ["/app"]