Upgrade Gitaly to faster CI runners

The CI pipeline in the Gitaly project is slow compared to test runs performed on local machines. While this is not surprising by itself, the strong contrast between a local testrun finishing in about 30 seconds while a CI run takes 15 minutes is astonishing. This slowness drags down efficiency of the Gitaly team, especially in connection with flakiness in the test suite which frequently requires baby-sitting of MRs.

We should consider updating Gitaly's CI runner to more performant machines to significantly reduce round-trip-time for CI runs to ultimately improve efficiency of the Gitaly team.

Details

• Point of contact for this request: pks-t