Adds comprehensive build versioning support to inject version information into all binaries at build time using ldflags

[Vikramarjuna]

Add Build Versioning Infrastructure

Summary

Adds comprehensive build versioning support to inject version information into all binaries at build time using ldflags.

Changes

New Files:

• lib/version/version.go - Version package with ldflags injection and fallback support
• scripts/version.lib - Shared bash library for version calculation (used by tarball scripts)
• .github/workflows/release.yml - Release workflow triggered on tag push with multi-arch builds

Modified Files:

• Makefile - Added version calculation from git tags, ldflags injection, and cross-compilation targets
• scripts/make-tarball - Updated to use version.lib for version injection
• cmd/installer/make-tarball - Updated to use version.lib for version injection
• All 29 cmd/*/main.go files - Added -version flag support

Version Format

Context	Format	Example
Tagged release	vX.Y.Z	v1.2.3
Main branch (post-tag)	vX.Y.Z-dev.N+commit	v1.2.3-dev.5+abc1234
Feature branch	vX.Y.Z-branch.N+commit	v1.2.3-feature-api.5+abc1234
Uncommitted changes	...-dirty	v1.2.3-dirty

Build Targets

Target	Description
make	Install to $GOPATH/bin (existing behavior, now with version)
make build	Build for current OS/arch to ./dist/
make build-linux	Build for Linux amd64
make build-linux-arm	Build for Linux arm64
make build-darwin	Build for macOS amd64 (excludes Linux-only commands)
make build-darwin-arm	Build for macOS arm64 (excludes Linux-only commands)
make <service>.tarball	Build deployment tarball with versioned binary

Darwin Build Exclusions

The following Linux-only commands are excluded from Darwin builds:

• installer - Linux syscalls, no cross-platform support
• subd - Linux syscalls, no cross-platform support
• image-unpacker - Has // +build linux constraint
• imaginator - Has // +build linux constraint

Release Workflow

• Triggered on tag push (v*)
• Builds 4 architectures in parallel (linux-amd64, linux-arm64, darwin-amd64, darwin-arm64)
• Generates SHA256 checksums
• Creates GitHub Release with tarballs

Usage

# Check version
./vm-control -version

# Output
vm-control v1.2.3-dev.5+abc1234
  Commit: abc1234
  Branch: main
  Built:  2026-01-29T12:00:00Z
  Go:     go1.25.4

# Short version
./vm-control -version -short
v1.2.3-dev.5+abc1234