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Adds a `version` variable set at build time via ldflags and a `--version` flag that prints it and exits. Checked before flag.Parse() so it doesn't conflict with the flag package. Makefile updated to pass `-X main.version=$(VERSION)` using git describe.
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Adds a
versionvariable set at build time via ldflags and a--versionflag that prints it and exits.var version = "dev"default, overridden by-X main.version=...flag.Parse()so it doesn't conflict with the flag package-X main.version=$(VERSION)usinggit describe