agent: add separate glibc build with NVML support (#1618)

purego requires dynamic linking, so split the agent builds:
- Default: static binary without NVML (works on musl/alpine)
- Glibc: dynamic binary with NVML support via purego

Changes:
- Add glibc build tag to conditionally include NVML code
- Add beszel-agent-linux-amd64-glibc build/archive in goreleaser
- Update ghupdate to use glibc binary on glibc systems
- Switch nvidia dockerfile to golang:bookworm with -tags glibc

agent/systemd_nonlinux_test.go

@@ -19,11 +19,11 @@ func TestSystemdManagerGetServiceStats(t *testing.T) {
 	assert.NoError(t, err)
 
 	// Test with refresh = true
-	result := manager.getServiceStats(true)
+	result := manager.getServiceStats("any-service", true)
 	assert.Nil(t, result)
 
 	// Test with refresh = false
-	result = manager.getServiceStats(false)
+	result = manager.getServiceStats("any-service", false)
 	assert.Nil(t, result)
 }