feat: PRWLR-3989 add PostgreSQL to project (#10)

* feat: PRWLR-3989 add postgresql to project

* chore: PRWLR-3989 add requested changes to docker structure

* chore: PRWLR-3989 update poetry.lock

docker-entrypoint.sh

@@ -0,0 +1,31 @@
+#!/bin/sh
+
+apply_migrations() {
+  echo "Applying database migrations..."
+  poetry run python manage.py migrate
+}
+
+start_dev_server() {
+  echo "Starting the development server..."
+  poetry run python manage.py runserver 0.0.0.0:8000
+}
+
+start_prod_server() {
+  echo "Starting the Gunicorn server..."
+  poetry run gunicorn -c backend/guniconf.py backend.wsgi:application
+}
+
+case "$1" in
+  dev)
+    apply_migrations
+    start_dev_server
+    ;;
+  prod)
+    apply_migrations
+    start_prod_server
+    ;;
+  *)
+    echo "Usage: $0 {dev|prod}"
+    exit 1
+    ;;
+esac