Test semantic-action to deploy using Zeit Now
Uses semantic-action to deploy to Zeit Now using now-pipeline. Read Semantic Action blog post.
Deploys to https://test-semantic-deploy-with-now-123.now.sh/ and the last deployed version is at
/build.json. This version
is fetched by url-to-sha plugin to determine the next version to publish.
Trace the deploy steps in the package.json to see all that is
necessary to determine if a new version should be deployed, generating new
public/build.json file with updated version and then deploying using now-pipeline.