Update pica-etherpad/secrets/etherpad-db.secrets.example, .gitlab-ci.yml,...

Update pica-etherpad/secrets/etherpad-db.secrets.example, .gitlab-ci.yml, pica-etherpad/secrets/encrypted-variables-test/etherpad-app/ETHERPAD_ADMIN_PASSWORD, pica-etherpad/secrets/encrypted-variables-test/etherpad-app/ETHERPAD_DB_NAME, pica-etherpad/secrets/encrypted-variables-test/etherpad-app/ETHERPAD_DB_USER, pica-etherpad/secrets/encrypted-variables-test/etherpad-app/ETHERPAD_DB_PASSWORD, pica-etherpad/secrets/encrypted-variables-test/etherpad-app/MYSQL_PORT_3306_TCP_ADDR, pica-etherpad/secrets/encrypted-variables-test/etherpad-db/MYSQL_ROOT_PASSWORD, pica-etherpad/secrets/encrypted-variables-test/etherpad-db/MYSQL_USER, pica-etherpad/secrets/encrypted-variables-test/etherpad-db/MYSQL_PASSWORD, pica-etherpad/secrets/encrypted-variables-test/etherpad-db/MYSQL_DATABASE files
Deleted pica-etherpad/secrets/etherpad-app.secrets.production, pica-etherpad/secrets/etherpad-app.secrets.test, pica-etherpad/secrets/etherpad-db.secrets.production, pica-etherpad/secrets/etherpad-db.secrets.test files