Add missing APP_DEPLOYMENT_ENV env variable

.env

@@ -33,6 +33,9 @@ KEYCLOAK_CLIENT_SECRET=
 APP_BUILDINFO=unknown  # a git hash or something identifying the build
 APP_BUILDINFO_URL='#'
 
+# Defines the deployment environment
+APP_DEPLOYMENT_ENV='local'
+
 # Secret token for the starter bundle example
 # This is just a defaule.
 # Create a ".env.local" file which is excluded from git to set it