Run only liquibase for deployment and in a second step the deployment of keycloak application

Getting advice
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4

@xgp Hi, i am trying this Keycloak Database creation - keycloak-database-update.sql - #2 by ssb
but i am getting the following error:

2024-06-19 13:02:38,689 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: liquibase.exception.MigrationFailedException: Migration failed for changeset META-INF/jpa-changelog-1.0.0.Final.xml::1.0.0.Final-KEYCLOAK-5461::sthorger@redhat.com:
     Reason: liquibase.exception.DatabaseException: Communications link failure

The last packet successfully received from the server was 228 milliseconds ago. The last packet sent successfully to the server was 228 milliseconds ago. [Failed SQL: (0) ALTER TABLE keycloak.REALM_ATTRIBUTE ADD CONSTRAINT FK_8SHXD6L3E9ATQUKACXGPFFPTW FOREIGN KEY (REALM_ID) REFERENCES keycloak.REALM (ID)]
2024-06-19 13:02:38,689 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: Migration failed for changeset META-INF/jpa-changelog-1.0.0.Final.xml::1.0.0.Final-KEYCLOAK-5461::sthorger@redhat.com:
     Reason: liquibase.exception.DatabaseException: Communications link failure

The last packet successfully received from the server was 228 milliseconds ago. The last packet sent successfully to the server was 228 milliseconds ago. [Failed SQL: (0) ALTER TABLE keycloak.REALM_ATTRIBUTE ADD CONSTRAINT FK_8SHXD6L3E9ATQUKACXGPFFPTW FOREIGN KEY (REALM_ID) REFERENCES keycloak.REALM (ID)]
2024-06-19 13:02:38,689 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: Communications link failure

The last packet successfully received from the server was 228 milliseconds ago. The last packet sent successfully to the server was 228 milliseconds ago. [Failed SQL: (0) ALTER TABLE keycloak.REALM_ATTRIBUTE ADD CONSTRAINT FK_8SHXD6L3E9ATQUKACXGPFFPTW FOREIGN KEY (REALM_ID) REFERENCES keycloak.REALM (ID)]
2024-06-19 13:02:38,689 ERROR [org.keycloak.quarkus.runtime.cli.ExecutionExceptionHandler] (main) ERROR: Communications link failure

Is it even possible to make the manual migration even it is documented? This documentation is for version 25 and not the 21.1.2 i am using.