Wade Simmons bab0d65514 populate default Build version if missing
Use the Go module information built into the binary if the Build var
wasn't set during the build.

This means if you install via a specific tag, you get:

    go install github.com/slackhq/nebula/cmd/nebula@v1.9.5

    $ nebula -version
    Version: 1.9.5

And if you install master, you get:

    go install github.com/slackhq/nebula/cmd/nebula@master

    $ nebula -version
    Version: 1.9.5-0.20250408154034-18279ed17b10
2025-04-08 12:04:22 -04:00
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