Initial approach for a CI/CD integrationtest

[sebasmannem]

I proposed to create a integration test framework.
This is draft until it is finished.

• initialize docker-compose
• create a DB2 container
• build the rpm
• create a postgres container
• with the rpm installed
• with postgres running
• test for postgres to be functioning properly
• test for db2 to be functioning properly
• load schema into db2
• create foreign schema in postgres
• run some tests against postgres
• run for all actively maintained postgres versions

[sebasmannem]

I now have Postgres up and running, and I have DB nearly up and running.
Next would be to load a schema into DB2, and load a foreign schema into PostgreSQL.
After that we can define and run an integration test (e.a. verify In postgres that we have a foreign schema, with n foreign tables, and that table a ..., etc. etc.).

[temuenz]

First introduction of the new functionality.

[temuenz]

@sebasmannem, thanks for this contribution, hence the processing is not completing. I guess you are still working on this one and it is not yet ready to be merged, right?