Move Cloud Run image property to GCP config struct

Signed-off-by: Tihomir Jovicic <tihomir.jovicic.develop@gmail.com>

examples/cloudrun-app/go-http-server/main.go

@@ -0,0 +1,35 @@
+// Sample run-helloworld is a minimal Cloud Run service.
+package main
+
+import (
+        "fmt"
+        "log"
+        "net/http"
+        "os"
+)
+
+func main() {
+        log.Print("starting server...")
+        http.HandleFunc("/", handler)
+
+        // Determine port for HTTP service.
+        port := os.Getenv("PORT")
+        if port == "" {
+                port = "8080"
+                log.Printf("defaulting to port %s", port)
+        }
+
+        // Start HTTP server.
+        log.Printf("listening on port %s", port)
+        if err := http.ListenAndServe(":"+port, nil); err != nil {
+                log.Fatal(err)
+        }
+}
+
+func handler(w http.ResponseWriter, r *http.Request) {
+        name := os.Getenv("NAME")
+        if name == "" {
+                name = "World"
+        }
+        fmt.Fprintf(w, "Hello %s!\n", name)
+}