Fix for version display in Docker

[rbgodwin-nt]

Changes :

• Add a shallow clone of the git repo (image size goes from 256.8MB to 257.97MB. This allows the Python code that displays the version of the test suite to work the same for a local repo and a docker container.
• Add tags for branches using commit SHA.
• Updated the versions of the GitHub actions to be the latest versions.
• Tested on NMOS Testbed.

[garethsb]

This looks excellent.

I know it was there before, but wondering what does branch: deploy-action mean?
Ah, @peterbrightwell says we can remove that, it's just a remnant from testing #602 before it was merged.

If the branch list includes both master and main, did the check for != master ought to be ! is_default_branch ?

Also should we put the 'publish-*' wildcard in the branch list too, same as we use to configure publishing to specs.amwa.tv?

[rbgodwin-nt]

The template is_default_branch refuses to work as part of any expression. After experimenting with things like enable = ! is_default_branch and getting errors and researching it for various options I concluded I'd have to use the to current form for the negative case.

I can add in publish-* as a wildcard, but perhaps we should think a bit more about how we would use that tag. Would it be the one used for the NMOS Testbed, for example, or other maintained deployments? We can go back to this idea later once we start seeing what makes sense for a "published" docker image.

[garethsb]

The template is_default_branch refuses to work as part of any expression.

Ah, it's currently tricky, see response from the author at docker/metadata-action#247

[rbgodwin-nt]

Looks like it's now an enhancement that might be picked up to be able to cleanly use is_default_branch to enable tags on non-default. Probably for consistency I'd prefer just to use something like the following and avoid is_default_branch entirely since it generates questions:

tags: |
            # Tag all builds with branch name and sha
            type=sha,prefix=${{ github.ref_name }}-
            # Tag each non-default branch with branch name and latest
            type=raw,value=latest,prefix=${{ github.ref_name }}-,enable=${{ github.ref_name != 'master' }}
            # Tag default branch with latest (no branch name prefix)
            type=raw,value=latest,enable=${{ github.ref_name == 'master' }}

[garethsb]

Ok, that's fine, then I'd change the comment about default to master and/or remove main from the list of branches as well as deploy-action. Since we don't use dev branch in this repo, do we remove that too? It seems any fork that wants to do this for other branches will have to edit or remove the branch list anyway...

[rbgodwin-nt]

Made the changes but left in dev. I think it could be useful as an integration branch that could be tied into the CI for NMOS Testbed to be able to pull in and run both the main branch and the dev branch of AMWA testing at all times. If not then AMWA maintainer for nmos-testing can just leave that branch out.

[garethsb]

LGTM