Finalize tag structure for Container images and implement in GH Actions

[EricWittmann]

There are two places where we build container images and push them to docker hub and quay:

• CI builds when a branch changes (master, 1.2.x, etc)
• CI builds when performing a manual release

In these cases we need to properly tag then container images before pushing them. The GH Actions responsible for the above tasks already do this, but the tags they use are a little confusing. Here we define what tags should be applied in both.

CI Builds for Branch Changes

When doing a CI build due to a change to the branch (e.g. when a change to master is merged from a PR), the following tags should be applied to the container images:

• When building from the master branch, apply the latest-snapshot
• When building from a maintenance branch, such as 1.2.x or 1.3.x, apply <branch-name>-snapshot (for example 1.3.x-snapshot)

CI Builds for Release

When doing a CI build due to a manually triggered release, the following tags should be applied to the container images:

• Apply the specific release version # tag, e.g. 2.0.7.Final
• When releasing from the master branch, apply latest-release
• When releasing from a maintenance branch, such as 1.2.x or 1.3.x apply <branch-name>-release (for example 1.3.x-release)