Make the ECR version tagging regular expression exactly match the image tag instead of containing

[dayuwang-wish]

Problem:

Currently, the tag of 8 char length short commit SHA on git is expected to be matched as a potential target associated with the deployment environment. However, the current Regex [0-9a-f]{5,40} matches any qualified preceding tokens, thus having the logic of "match any". This would cause a problem with unexpected matches, e.g., when a branch name master and timestamp ensemble a tag master_1671212099 for example, this will be also matched with the regex, thus violating Wish internal naming convention.

So this PR is to make the regex exactly match the tag, instead of "match any".

Testing

Add unit test registry/ecr/provider_test.go

Local Docker build

docker build -t nearmap/kcd .

xxxx
xxxx

 => exporting to image                                                                                                                                                                                                                                                                                0.2s
 => => exporting layers                                                                                                                                                                                                                                                                               0.2s
 => => writing image sha256:5757f4b0f53810a8ee441893f3483a62ebfc376d90d60fd30f269a06e119e74e                                                                                                                                                                                                          0.0s
 => => naming to docker.io/nearmap/kcd