nixos/keycloak: KEYCLOAK_ADMIN{,PASSWORD} -> KC_BOOTSTRAP_ADMIN_{USERNAME,PASSWORD}

              mkdir -p /run/keycloak/ssl

              cp $CREDENTIALS_DIRECTORY/ssl_{cert,key} /run/keycloak/ssl/

            '' + ''

              export KEYCLOAK_ADMIN=admin

              export KEYCLOAK_ADMIN_PASSWORD=${escapeShellArg cfg.initialAdminPassword}

              export KC_BOOTSTRAP_ADMIN_USERNAME=admin

              export KC_BOOTSTRAP_ADMIN_PASSWORD=${escapeShellArg cfg.initialAdminPassword}

              kc.sh --verbose start --optimized

            '';

          };