chore: add envbuilder subsystem if using inside Coder (#110)

Author: kylecarbs

cmd/envbuilder/main.go

@@ -55,6 +55,17 @@ func main() {
 				var flushAndClose func(ctx context.Context) error
 				sendLogs, flushAndClose = agentsdk.LogsSender(agentsdk.ExternalLogSourceID, client.PatchLogs, slog.Logger{})
 				defer flushAndClose(cmd.Context())
+
+				// This adds the envbuilder subsystem.
+				// If telemetry is enabled in a Coder deployment,
+				// this will be reported and help us understand
+				// envbuilder usage.
+				subsystems := os.Getenv("CODER_AGENT_SUBSYSTEM")
+				if subsystems != "" {
+					subsystems += ","
+				}
+				subsystems += string(codersdk.AgentSubsystemEnvbuilder)
+				os.Setenv("CODER_AGENT_SUBSYSTEM", subsystems)
 			}
 
 			options.Logger = func(level codersdk.LogLevel, format string, args ...interface{}) {