Merge pull request #19898 from prathamesh-sonpatki/common-secrets

 Added an example to show how common secrets can be shared across multiple environments in secrets.yml [ci skip]

railties/lib/rails/generators/rails/app/templates/config/secrets.yml

@@ -10,6 +10,22 @@
 # Make sure the secrets in this file are kept private
 # if you're sharing your code publicly.
 
+# You can also share common secrets in multiple environments
+# using YAML anchor/reference syntax.
+
+# common: &common
+#   api_key:    <%= API_KEY %>
+#   api_secret: <%= API_SECRET %>
+
+# development:
+#   <<: *common
+#
+# test:
+#   <<: *common
+#
+# production:
+#   <<: *common
+
 development:
   secret_key_base: <%= app_secret %>