feat: add docker support and docker-compose quickstart

Add support for production container builds using the provided `Dockerfile` and `build.sh` script. This can later be used with actions to automatically publish to the provided docker registry.

Additionally, support an accelerated developer quickstart using `docker-compose`. Developers can now run the `dx` npm command to quickly spin up a database and mail server.

docker/compose-without-app.yml

@@ -0,0 +1,16 @@
+services:
+  database:
+    image: postgres:15
+    environment:
+      - POSTGRES_USER=documenso
+      - POSTGRES_PASSWORD=password
+      - POSTGRES_DB=documenso
+    ports:
+      - 5432:5432
+
+  inbucket:
+    image: inbucket/inbucket
+    ports:
+      - 9000:9000
+      - 2500:2500
+      - 1100:1100