[CI] Backport usage of db service for 8.1

Nightly already uses them. We're running into port clashes otherwise.

Closes GH-16647

Fix nightly for 8.2

Backport of af721c9c361643df13a8137d22de9acde82512e5

[skip ci] Don't suppress setup-slapd.sh output

This step frequently fails in CI. We would like to now why to see if we can
improve stability.

Test oci8 & pdo_oci in CI

Closes GH-8348

Migrate CI to GitHub actions