Build container image in two steps

[gvegayon]

Based on the work I've done with cfa-epinow2-pipeline, pyrenew-hew, and other projects on CDCent side, we should build an action that automates these processes. Some of the requirements:

• Caching should be passed as a key directly as an argument (is easier).
• Users should provide a user and password for logging in to the registry.
• For the container tagging, it should receive the following arguments:
  • registry, e.g., cfaprodbatchcr.azurecr.io
  • name, e.g., cfa-epinow2-pipeline
• It should have a push argument for both images, with the default being false.