feature: print runtime git commit

[hhyasdf]

Pull Request Description

Describe what this PR does / why we need it

Print runtime commit id of Rama in rama-manager and rama-daemon logs. It helps us to find the correct commit id while debugging.

Does this pull request fix one issue?

NONE

Describe how you did it

Link a flag "main.gitVersion" while building binaries, and add logs in rama-daemon and rama-manager.

Describe how to verify it

Run rama-daemon and rama-manager pod, logs of "starting rama manager with git version: " will be printed at the first place. Executing command of "cat /rama/COMMIT_ID" in pod will show commit id too.

Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #19 (26c3499) into main (0633357) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #19   +/-   ##
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  Coverage   13.21%   13.21%           
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  Files          22       22           
  Lines        1907     1907           
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  Hits          252      252           
  Misses       1606     1606           
  Partials       49       49           

Flag	Coverage Δ
unittests	13.21% <ø> (ø)

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[mars1024]

IMO, I don't think this will help us a lot, because

1. log won't be kept for a long time, it rotates usually
2. commit id is not useful compared with tag, which could be found in image url

[hhyasdf]

IMO, I don't think this will help us a lot, because

1. log won't be kept for a long time, it rotates usually
2. commit id is not useful compared with tag, which could be found in image url

For the first problem, I add an /rama/VERSION file into the image for long time usage.

For the second problem, image tag sometimes is unreliable. This happens mostly in develop environment, developer sometime don't know the exact code version if they dose not use a official release or have changed the image's tag.

[mars1024]

/lgtm
/approve
thanks!