Update golang base image in Dockerfile

Author: ahmedwaleedmalik

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM registry.svc.ci.openshift.org/openshift/release:golang-1.14 as builder
+FROM golang:1.15.2 as builder
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -25,4 +25,4 @@ WORKDIR /
 COPY --from=builder /workspace/manager .
 USER nonroot:nonroot
 
-ENTRYPOINT ["/manager"]
+ENTRYPOINT ["/manager"]