Use --debug CLI option and debug attribute instead of FLASK_ENV

Deprecated in Flask 2.2, see pallets/flask#4714.
Also use --app CLI option instead of FLASK_APP for consistency

back/Dockerfile

@@ -13,15 +13,11 @@ RUN pip install -r requirements.txt && rm requirements.txt
 # cf. https://stackoverflow.com/a/60820156/3865876
 FROM base AS production
 # Launch WSGI server, configured by gunicorn.conf.py
-ENV FLASK_ENV production
 CMD gunicorn
 
 FROM base AS development
 # Path of module containing Flask app, relative to WORKDIR
-ENV FLASK_APP boxtribute_server/main
-ENV FLASK_ENV development
-CMD flask run -h 0.0.0 -p 5000
+CMD flask --debug --app boxtribute_server.main run -h 0.0.0 -p 5000
 
 # Select final stage depending on flask_env argument
 FROM ${flask_env} AS final
-RUN echo Using $FLASK_ENV

back/boxtribute_server/routes.py

@@ -3,7 +3,7 @@
 
 from ariadne import graphql_sync
 from ariadne.constants import PLAYGROUND_HTML
-from flask import Blueprint, jsonify, request
+from flask import Blueprint, current_app, jsonify, request
 from flask_cors import cross_origin
 
 from .auth import request_jwt, requires_auth
@@ -47,7 +47,7 @@ def query_api_server():
         query_api_schema,
         data=request.get_json(),
         context_value=request,
-        introspection=os.getenv("FLASK_ENV") == "development",
+        introspection=current_app.debug,
         error_formatter=format_database_errors,
     )
 
@@ -91,7 +91,7 @@ def graphql_server():
         data=request.get_json(),
         context_value=request,
         debug=debug_graphql,
-        introspection=os.getenv("FLASK_ENV") == "development",
+        introspection=current_app.debug,
         error_formatter=format_database_errors,
     )