fix(git): commit id is correctly determined for annotated symbolic ref tags

[miki725]

• [x] Followed the steps in the contributor's guide: https://crashoverride.com/docs/other/contributing#filing-the-pull-request
• [x] PR title uses semantic commit messages
• [x] Filled out the template to a useful degree
• [x] Updated CHANGELOG.md if necessary

Issue

wrong commit id is reported

Description

.git/HEAD can be a symbolic ref to a branch/tag or directly pointer to a commit. When doing git checkout <branch> it normally sets it to symbolic ref however when doing git checkout <tag> it usually sets it directly to the tag's commit. However it is possible to update it via git symbolic-ref HEAD <tag>. In that case HEAD will point to annotated tag and as such we chalk simply opens the ref of that symbolic ref it is not guaranteed to be for a commit id. Now chalk loads the tag object and if it is an annotated tag, resolves commit id to be from the tags object pointer.

Testing

➜ make tests args="test_git.py::test_repo[False-copy_files0-True-None-True-True] --logs -x"

[miki725]

all other keys are derived from the commit so if chalk cant figure out correct commit id, rest are descriptions of the commit so I think thats the most critical part to mention in the changelog but we can improve before release if we like