Centrally define dev image build action

[kimburgess]

Move build steps from the build-dev-image template (and by extension copies in each repo) into a composite run action, which service repos then reference. This should DRY up some of the config and help keep container formats, metadata and other cruft consistent.

This can then be reference as a single step in a general CI workflow.

[kimburgess]

Action defined in actions/build-dev-image.yml.

Blocked on usage until actions/runner#646 is resolved.

[caspiano]

This will be a relatively simple task.

The only requirements are...

• extracting the build dev image workflow into the .github repo

• updating several of our services to call the centrally defined workflow

  • auth
  • build
  • core
  • dispatch
  • frontend-loader
  • init
  • nginx
  • portal-api
  • rest-api
  • rubber-soul
  • source
  • staff-api
  • triggers