Fix postgres LOB auto commit not allowed

This is a workaround as found here: vaadin/starters#94
See also: vaadin/starters#85

To run the docker compose, you must also build the java
project in production mode via `mvn clean package -Pproduction`
(which will build a fat JAR with all dependencies), then
build the docker container before running docker compose
(you can also just run `docker compose up --build`)

src/main/java/com/tikelespike/nilee/security/AuthenticatedUser.java

@@ -20,6 +20,7 @@ public AuthenticatedUser(AuthenticationContext authenticationContext, UserReposi
         this.authenticationContext = authenticationContext;
     }
 
+    @Transactional
     public Optional<User> get() {
         return authenticationContext.getAuthenticatedUser(UserDetails.class)
                 .map(userDetails -> userRepository.findByUsername(userDetails.getUsername()));

src/main/java/com/tikelespike/nilee/security/UserDetailsServiceImpl.java

@@ -21,6 +21,7 @@ public UserDetailsServiceImpl(UserRepository userRepository) {
         this.userRepository = userRepository;
     }
 
+    @Transactional
     @Override
     public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
         User user = userRepository.findByUsername(username);