🔧 Use plain base official Python Docker image (#1351)

backend/Dockerfile

@@ -1,4 +1,4 @@
-FROM tiangolo/uvicorn-gunicorn-fastapi:python3.10
+FROM python:3.10
 
 WORKDIR /app/
 

backend/README.md

@@ -155,7 +155,7 @@ If you don't want to use migrations at all, uncomment the lines in the file at `
 SQLModel.metadata.create_all(engine)
 ```
 
-and comment the line in the file `prestart.sh` that contains:
+and comment the line in the file `scripts/prestart.sh` that contains:
 
 ```console
 $ alembic upgrade head

backend/scripts/prestart.sh

@@ -1,5 +1,8 @@
 #! /usr/bin/env bash
 
+set -e
+set -x
+
 # Let the DB start
 python app/backend_pre_start.py