Add application.properties with default connection parameters

bootstrap/src/main/resources/application.properties

@@ -1,3 +1,11 @@
-# No properties required for this demo application
-# You would put database connection parameters here, for example.
-# But in dev mode, Quarkus creates those auto-magically.
+# Without this line, Quarkus would abort with the following error message:
+# "Model classes are defined for the default persistence unit but configured datasource not found:
+#  the default EntityManagerFactory will not be created."
+%prod.quarkus.datasource.jdbc.url=dummy
+%prod.persistence=inmemory
+
+%mysql.quarkus.datasource.jdbc.url=jdbc:mysql://localhost:3306/shop
+%mysql.quarkus.datasource.username=root
+%mysql.quarkus.datasource.password=test
+%mysql.quarkus.hibernate-orm.database.generation=update
+%mysql.persistence=mysql