fix(tests): resolve Oracle container initialization race condition #4630
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Remove APP_USER/APP_USER_PASSWORD environment variables from OracleFixture and create the application user programmatically after container startup. The gvenzl/oracle-free image's built-in user provisioning script had a race condition where it attempted to create the user before the pluggable database (FREEPDB1) was fully opened, causing ORA-01109 errors and exit code 85. Now explicitly open all PDBs, switch to FREEPDB1 context, and create the appuser after the container passes readiness checks, ensuring reliable initialization in CI and local environments. Fixes intermittent OracleMdaTests failures with "database not open" errors.
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Why
Fixes #
The database fails to start intermittently because it attempted to create the user before the pluggable database fully opened.
What
Fixes intermittent OracleMdaTests failures with "database not open" errors.
Tests
Checklist
CHANGELOG.mdis updated.