Added application code

Author: kostis-codefresh

source-code/Dockerfile

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+FROM golang:1.15.1-alpine3.12 AS build-env
+
+WORKDIR /tmp/simple-go-app
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux go build 
+
+FROM scratch
+COPY --from=build-env /tmp/simple-go-app/simple-web-app /app/simple-web-app
+
+EXPOSE 8080
+CMD ["/app/simple-web-app"]

source-code/README.md

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+A sample GO web application with Dockerfile
+

source-code/go.mod

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+module github.com/codefresh-contrib/gitops-certification-examples/simple-web-app
+
+go 1.15

source-code/trivial-web-server.go

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+package main
+
+import (
+	"fmt"
+	"net/http"
+)
+
+func indexHandler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "I am an application running in Kubernetes. Now at Version 1.0")
+
+}
+
+func main() {
+	fmt.Println("Basic web server is starting on port 8080...")
+	http.HandleFunc("/", indexHandler)
+	http.ListenAndServe(":8080", nil)
+}