fix: use specific Fedora version, handle TextField deprecation

Containerfile

@@ -1,4 +1,4 @@
-FROM fedora-minimal:latest
+FROM fedora-minimal:37
 
 RUN microdnf install --assumeyes \
 	python3-flask \

app/qrwebform.py

@@ -2,7 +2,7 @@
 
 from flask import Flask, render_template, flash, request
 from flask_wtf import FlaskForm
-from wtforms import Form, BooleanField, SubmitField, TextField
+from wtforms import Form, BooleanField, SubmitField, StringField
 from wtforms.validators import DataRequired
 import os
 
@@ -12,7 +12,7 @@ app.config.from_object(__name__)
 app.config['SECRET_KEY'] = os.urandom(40)
 
 class QRForm(FlaskForm):
-    user_data = TextField("Dane:", validators=[DataRequired()])
+    user_data = StringField("Dane:", validators=[DataRequired()])
     trim_spaces = BooleanField("Usuń spacje", default=True)
     submit = SubmitField("Generuj")
 

app/templates/main.html

@@ -23,7 +23,7 @@
 <hr>
 
 <p>
-<div><img src="{{ genurl }}?size=512&data={{ data | urlencode }}"> <br/>
+<div><img src="{{ genurl }}?size=256&data={{ data | urlencode }}"> <br/>
 	{{ data }}
 </div>
 </p>