Deploy a new version of an html block to metablock cloud.

• token: Metablock API token, you need to create one on the metablock admin. Alternatively set the METABLOCK_API_TOKEN environment variable.
• block: Metablock Block ID. Alternatively set the METABLOCK_BLOCK_ID environment variable.
• bundle: bundle location. Alternatively set the BUNDLE_LOCATION environment variable, (it defaults to ./dist if not provided)
• env: environment where to deploy, either stage or prod, (it defaults to stage if not provided). Can be set via METABLOCK_ENV environment variable.
• name: optional deployment name

Check the build.yml manifest file for an example where pull requests to master are deployed to stage and a merge to master to prod.