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/.dockerignore

@@ -0,0 +1,13 @@
+# The .dockerignore file excludes files from the container build process.
+#
+# https://docs.docker.com/engine/reference/builder/#dockerignore-file
+
+# Exclude locally vendored dependencies.
+vendor/
+
+# Exclude "build-time" ignore files.
+.dockerignore
+.gcloudignore
+
+# Exclude git history and configuration.
+.gitignore