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 set the vaadin app to
production mode and build the java project, 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);