Update tool-Docker-action to v2.1.0

[nwiltsie]

This PR updates the tool-Docker-action Action to version 2.1.0. There are a few big changes in this version:

1. Pushing to any branch foo will build this repository's image and tag it as branch-foo. That tagged image will be removed when the branch is deleted.
2. By default the Action will only build SemVer tags (e.g. v1.2.3-xxx). Repositories that need to use other kinds of tags (e.g. v1.2beta) can pass the optional non-semver-tags argument; doing so will build all tags that begin with v.

There are a bunch of smaller changes buried in there - you can see them all at this link.

Based on this repository's existing tags, I've determined that it does follow semantic versioning. The updated workflow therefore does not pass the non-semver-tags argument to the Action, although it can be uncommented in the future if need be.

[nwiltsie]

Hmm, something's wonky here. The image isn't building correctly and I don't think it's related to my changes. @dan-knight can you review the build logs and see if you can figure out the problem?

[dan-knight]

Weird. The error message isn't super informative, at least to me. @Faizal-Eeman created this image, so I wonder if he knows more about that line.

[Faizal-Eeman]

Hmm, something's wonky here. The image isn't building correctly and I don't think it's related to my changes. @dan-knight can you review the build logs and see if you can figure out the problem?

Created an issue to look into this. #10 (comment)

[nwiltsie]

@Faizal-Eeman confirmed that the build issue is unrelated to this change, so I'm going to go ahead and merge this. That will make it much easier to fix, as any new PRs will try to build the image!

[Faizal-Eeman]

Updates in the PR are independent of the CICD error.

This PR can be merged.