✨ Adds MariaDB image with direct LDAP PAM authentication

- Introduced a new Containerfile to build a MariaDB image with direct LDAP PAM support.
- Implemented a custom PAM module (`pam_ldap_direct.so`) built from the PADL source to avoid dependencies on `libpam-ldap` and `nslcd`.
- Updated the entrypoint script to dynamically generate the PAM configuration file (`/etc/pam_ldap.conf`) based on environment variables.
- Added a README.md to document the image usage, configuration, and build process.
- Created a test suite to validate the image build and entrypoint behavior, ensuring proper handling of environment variables and configuration generation.
- Configured health checks and ensured the stock MariaDB entrypoint and lifecycle are preserved.

database/ldap2pg/Containerfile

@@ -54,8 +54,6 @@ COPY --from=builder /out/ldap2pg /usr/bin/ldap2pg
 # Fetch the upstream docker entrypoint pinned to the same release tag.
 ADD --chmod=0755 https://raw.githubusercontent.com/dalibo/ldap2pg/v${LDAP2PG_VERSION}/docker/docker-entrypoint.sh /usr/local/bin/docker-entrypoint.sh
 
-COPY --chmod=0755 provision-user-db.sh /workspace/provision-user-db.sh
-
 ENTRYPOINT ["docker-entrypoint.sh"]
 
 RUN /usr/local/bin/docker-entrypoint.sh --version