Add Google Cloud Platform Labels Support

[jbutz]

What did you implement:

Closes #94

How did you implement it:

I added a new property to the properties object on the function template, when compiling the functions. The resulting value, an object, is the result of merging a labels property on the provider object and a labels property on the function object. The function object's labels object takes priority, overriding properties on the provider objects's labels.

If no labels properties are defined the result is an empty object.

How can we verify it:

Use the following serverless.yml file in association with the google-nodejs template, changing the credentials and project values as necessary.

service: gcf-nodejs

provider:
  name: google
  runtime: nodejs
  project: my-project
  credentials: ~/.gcloud/keyfile.json
  labels:
    app: google-nodejs-example
    test: provider-label
    

plugins:
  - serverless-google-cloudfunctions

package:
  exclude:
    - node_modules/**
    - .gitignore
    - .git/**

functions:
  first:
    handler: http
    events:
      - http: path
    labels:
      test: function-label

Deploy the function then login the Google Cloud Platform console and go to the Functions section. Select the function you just deployed. On the right the pane should show an app label with the value google-nodejs-example and a test label with the value function-label

Todos:

• Write tests
• Write documentation
• Fix linting errors
• Make sure code coverage hasn't dropped
• Provide verification config / commands / resources
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[jbutz]

I intend to update the documentation in the main repo next, but that can't really be deployed until this is released.

[adnasa]

LGTM.
let's hope you get yourself a merge soon 😉

[adnasa]

yes, this makes much more sense now after your comment in #94

[adnasa]

LGTM.
let's hope you get yourself a merge soon 😉

[jbutz]

I have created a PR on the main serverless repo for the documentation

[jbutz]

@pmuens are you able to review this?

[pmuens]

Sweet! That looks good from a code perspective 👍

Thanks for adding this @jbutz and thanks for reviewing @adnasa 👍