Don't rebuild daemon every time new git refs are fetched

[Serock3]

Fixes DES-950

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This change is 

[linear[bot]]

DES-950 Daemon needs to be rebuilt whenever `.git/refs` changes

[Serock3]

I did however add an explicit check for being in a valid repository, otherwise -dev-unknown is appended to the version.

I reverted this behavior, as per our discussion.

If the repo is valid but the release tag still cannot be found, we now default to appending a -dev-$hash suffix to make it slightly harder to accidentally produce something that looks like a release build.

This was how it worked from the start. The behavior is unchanged, sorry for the confusion on my part.