Don't re-add the ENQUEUE_DSN from the bundle - just suggest

enqueue/gps/0.7/manifest.json

@@ -1,5 +1,5 @@
 {
     "env": {
-        "ENQUEUE_DSN": "gps:"
+        "PUBSUB_EMULATOR_HOST": "http://localhost:8900"
     }
 }

enqueue/gps/0.7/post-install.txt

@@ -0,0 +1,11 @@
+<bg=yellow;fg=black>                                 </>
+<bg=yellow;fg=black> Using Google Pub Sub in Enqueue </>
+<bg=yellow;fg=black>                                 </>
+
+  * Configure <comment>ENQUEUE_DSN=gps:</comment> in your <comment>.env</comment> file.
+
+  * Also configure the <comment>PUBSUB_EMULATOR_HOST</comment> environment
+    variable in <comment>.env</comment>.
+
+  * For the full options, see
+    <comment>https://github.com/php-enqueue/enqueue-dev/blob/master/docs/transport/gps.md</comment>