Auto-label PRs based on their content [skip-ci]

[jolorunyomi]

This PR adds the GitHub action PR Labeler to auto-label PRs based on their content.

Labeling is managed with a configuration file .github/labeler.yml using the following options

[codecov-io]

Codecov Report

Merging #480 (13e9130) into branch-0.18 (b170b29) will increase coverage by 0.95%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.18     #480      +/-   ##
===============================================
+ Coverage        90.40%   91.35%   +0.95%     
===============================================
  Files               15       18       +3     
  Lines             1126     1435     +309     
===============================================
+ Hits              1018     1311     +293     
- Misses             108      124      +16     

Impacted Files	Coverage Δ
dask_cuda/device_host_file.py	90.90% <0.00%> (-7.96%)	⬇️
dask_cuda/explicit_comms/utils.py	100.00% <0.00%> (ø)
dask_cuda/proxify_host_file.py	100.00% <0.00%> (ø)
dask_cuda/proxify_device_objects.py	91.83% <0.00%> (ø)
dask_cuda/get_device_memory_objects.py	89.04% <0.00%> (ø)
dask_cuda/explicit_comms/comms.py	99.02% <0.00%> (+0.01%)	⬆️
dask_cuda/cli/dask_cuda_worker.py	96.92% <0.00%> (+0.09%)	⬆️
dask_cuda/local_cuda_cluster.py	81.17% <0.00%> (+0.68%)	⬆️
dask_cuda/cuda_worker.py	78.75% <0.00%> (+1.73%)	⬆️
dask_cuda/proxy_object.py	89.80% <0.00%> (+2.00%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b170b29...3882a8a. Read the comment docs.

[jakirkham]

Made a few suggestions below. There are also a few files not handled like .coveragerc, .readthedocs.yml, setup.py, etc. I'm not sure how we want to handle these.

[ajschmidt8]

Most of the labels listed in labeler.yml don't yet exist in the repo, so they will likely need to be added.

[mike-wendt]

@ajschmidt8 can you re-review?
@jakirkham can you review for this repo?

[jakirkham]

Sure. Also cc @pentschev in case you have thoughts here

[jakirkham]

Had one minor suggestion. Can include, alter, or skip. Looks good otherwise

[pentschev]

I think adding docs/ is good too, otherwise LGTM.

[mike-wendt]

@pentschev @jakirkham added doc label to docs/ path

[mike-wendt]

@gpucibot merge