feat(docker): add multistage build for emulator and deployment

[thenav56]

Change:

• Separate out base and simulator build using multi-stage

NOTE:

Requires this change in mapswipe-backend

diff --git a/docker-compose.yaml b/docker-compose.yaml
index 2ef72bd0..1d2254a5 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -1,6 +1,7 @@
 x-firebase: &base_firebase_setup
   build:
     context: ./firebase/
+    target: emulator
   stop_grace_period: 30s
   tty: true
   entrypoint: ["./docker_entrypoint.sh"]

[tnagorra]

Superseded by #37