If you got any startup issues you can try to rebuild app containers.
You won't lose any data with this way - it's a safe reset.
docker-compose stop
docker-compose rm --force app
docker-compose build --no-cache app
docker-compose up -dReset all containers, delete all data (mysql, solr ..) but not your project files in app/!
docker-compose stop
docker-compose rm --force
docker-compose build --no-cache
docker-compose up -d