adjust workspace_status to respect tags

[jrockway]

This is somewhat hairy. I tested against master (2.10.0-pre.g1828ed42e4) and v2.9.0-rc.1. In the case where HEAD isn't an exact tag, we fall back to the 2.10.0 + pre.gXXXXXX. In the case where HEAD is an exact tag, we strip off the v and split at the first -; v2.9.0-rc.1 becomes APP_VERSION 2.9.0 ADDITIONAL_VERSION -rc.1.

Some attention is paid to the status of the working copy. As you edit the code, you create new versions, but git has no way to know this. Prior to this commit, we just tacked on "dirty", but that means when you have a dirty version running and want to re-push, the version checking logic in pachdev can't know if the new code is running or not. For that reason, the "dirty" annotation is now the first 10 bytes of the sha256 of the diffs. It sounds crazy, but basically only changes when you edit stuff, so should result in perfect fidelity. It's also not noticeably slow on my machine.

I think this is the algorithm we want.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1b87d37) 59.34% compared to head (09a4119) 59.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9726      +/-   ##
==========================================
- Coverage   59.34%   59.23%   -0.12%     
==========================================
  Files         583      583              
  Lines       71139    71139              
==========================================
- Hits        42220    42136      -84     
- Misses      28295    28391      +96     
+ Partials      624      612      -12     

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[molinamelendezj]

and this is so it wont show 0.0.0-sha anymore right.