[docker] Enable image builds from git worktrees #3660
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This change enables docker image builds from [git worktrees](https://git-scm.com/docs/git-worktree). This required discoverying the git commit used to configure the avalanchego build script in advance of image build and providing it as an argument to image build. Previously, it was impossible to build docker images from a git worktree: - the avalanchego build script needed to discover the git commit to configure the binary with for traceability - the build script assumed a .git directory to discover the git commit - the dockerfile copied the working tree into the image prior to running the avalanchego build script - if the working tree was for a git worktree, the resulting copy wouldn't have a .git directory to discovery the git commit from - instead of a regular .git directory, a non-primary worktree has a .git file referencing a path in the primary worktree's .git directory.
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Why this should be merged
This change enables docker image builds from git worktrees. This required discoverying the git commit used to configure the avalanchego build script in advance of image build and providing it as an argument to image build.
Previously, it was impossible to build docker images from a git worktree:
How this was tested
CI
Need to be documented in RELEASES.md?
N/A