Add CI (#4)

* Added credo

* Added and ran Prettier; First pass at GH Actions

* Updated actions workflow to hopefully work on this branch

* Name the folder correctly how about

* Added proper container prefix to commands

* Apparently you have to get back into the root after commands

* CI is working, update branches to final value

docker-compose.ci.yml

@@ -0,0 +1,16 @@
+version: '3'
+services:
+  postgres:
+    image: 'postgres:16-alpine'
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+
+  phx:
+    build: .
+    volumes:
+      - '.:/app'
+    ports:
+      - '4008:4008'
+    command: tail -F /dev/null
+    env_file: .env