Add configuration to disable bootstrap of admin account

[marioschlipf]

I've came across a challenge when using this testcontainer in combination with importing realm configuration: Since the env variable for bootstrapping admin accounts are hardcoded, I cannot automatically import a full Keycloak configuration:

            withEnv("KC_BOOTSTRAP_ADMIN_USERNAME", adminUsername);
            withEnv("KC_BOOTSTRAP_ADMIN_PASSWORD", adminPassword);

Auto-importing configuration like so will fail, if the realm contains an admin user:

new KeycloakContainer()
            .withRealmImportFiles(MASTER_REALM_USERS_JSON))

The use case for this is that one might want to export and import a 1:1 export of a running keycloak installation for test reasons.

I've added a flag to disable this behavior, see the test.

[dasniko]

Thanks for this PR, generally LGTM and makes somehow sense with the new behavior.

There are some small issues, mentioned directly at the code, please review and fix it.
Additionally, there is some documentation missing. Please add a paragraph in the README file.

Thanks.

[marioschlipf]

Additionally, there is some documentation missing. Please add a paragraph in the README file.

Thanks, comments addressed and documentation amended. I moved the Initial admin user credentials section above the Realm Import so the added paragraph makes sense.

PS: Greetings from a fellow Darmstaedter :-)

[dasniko]

LGTM, thanks!

[marioschlipf]

Thanks for the approval, I don't have the rights to merge though

[dasniko]

Yes, and that's good as this is my repo and would yield to a security issue if anybody would have merge rights.

Running the tests take some time and I don't have always this time to wait, so reviewing and merging are separate tasks at different times.
And before you ask - merging a new feature does not necessarily result in a new release. Be patient 🧘