Update workflow names and Readme (#29)

* update readme

* fix typo

Author: stanleegoodspeed

.github/workflows/ads-java.yml

@@ -1,4 +1,4 @@
-name: Ads
+name: Ads - Java
 
 on:
   push:

.github/workflows/ads.yml

@@ -1,4 +1,4 @@
-name: Ads
+name: Ads - Python
 
 on:
   push:

README.md

@@ -56,4 +56,9 @@ Visit http://localhost:4000/admin
 ```
 Username: [email protected]
 Password: spree123
-```
+```
+
+## Image publication
+Images are stored in our public ECR repo `public.ecr.aws/x2b9z2t7`. On PR merges, only the affected services will be pushed to the ECR repo, using the `latest` tag. For example, if you only made changes to the `backend` service, then only the `backend` Github workflow will trigger and publish `public.ecr.aws/x2b9z2t7/storedog/backend:latest`. 
+
+Separately, we tag and publish *all* images when a new release is created with the corresponding release tag e.g. `public.ecr.aws/x2b9z2t7/storedog/backend:1.0.1`. New releases are made on an ad-hoc basis, depending on the recent features that are added.