Add git tags to dagu version (Fixes #816)

[arky]

Fetch git tag and appended to LDFLAGS in Makefile.

Improve dagu version command line output with github tags.

Fixes #816

[arky]

The output now shows complete build version

$ .local/bin/dagu version
v1.16.0-23-gc831612d6-250210213530

[yohamta]

Looking great! Thank you so much! 🚀🚀🚀

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.89%. Comparing base (c831612) to head (6811390).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #822      +/-   ##
==========================================
- Coverage   55.93%   55.89%   -0.04%     
==========================================
  Files          73       73              
  Lines        7920     7920              
==========================================
- Hits         4430     4427       -3     
- Misses       3110     3112       +2     
- Partials      380      381       +1     

see 1 file with indirect coverage changes

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