Hello world application

(cherry picked from commit f2c76ad6214350c6ca93ea74ed6765c48613e32d)

openshift-app-sample/Dockerfile

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+ FROM golang:1.15 as builder
+ ENV APP_USER app
+ ENV APP_HOME /go/src/openshift-app-sample
+ RUN groupadd $APP_USER && useradd -m -g $APP_USER -l $APP_USER
+ RUN mkdir -p $APP_HOME && chown -R $APP_USER:$APP_USER $APP_HOME
+ WORKDIR $APP_HOME
+ USER $APP_USER
+ COPY src/ .
+ RUN go build -o openshift-app-sample
+
+ FROM golang:1.15
+ ENV APP_USER app
+ ENV APP_HOME /go/src/openshift-app-sample
+ RUN groupadd $APP_USER && useradd -m -g $APP_USER -l $APP_USER
+ RUN mkdir -p $APP_HOME
+ WORKDIR $APP_HOME
+ COPY --chown=0:0 --from=builder $APP_HOME/openshift-app-sample $APP_HOME
+ USER $APP_USER
+ CMD ["./openshift-app-sample"]

openshift-app-sample/src/main.go

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+// Copyright (c) IBM Corporation 2021.
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License 2.0, which is available at
+// http://www.eclipse.org/legal/epl-2.0.
+//
+// SPDX-License-Identifier: EPL-2.0
+
+// Package main provides the entry point for a executable application.
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello World!!!")
+}