[Bug] Excessive/duplicate CI runs

[andrewazores]

          I, uh, think that was a little excessive :sweat_smile: 

I suspect this is the problem:

cryostat-core/.github/workflows/ci.yaml

Line 4 in 17a29a3

group: ci-${{ github.run_id }}

The concurrency group is based on the run ID, but each time the PR is relabelled or a new commit is pushed I think that triggers a new run with a new ID, so many concurrent jobs can be running in the background on the same actual code if we're just relabelling the PR etc.

Originally posted by @andrewazores in #279 (comment)