CI: Enable using labels to control GHA workflows

[janeyx99]

Fixes #62852

Sets a global environment variable containing a list of PR labels. For this PR, the PR_LABELS variable looks like:

[
  "cla signed",
  "ciflow/default"
]

confirmed in a run: https://github.com/pytorch/pytorch/runs/3490072161?check_suite_focus=true

This information can be used in other workflow steps to control the logic. For example, if I want to force a build, I can label my PR with "force-build" and do something like the following in my build script:

if [[ "${PR_LABELS}" = *force-build* ]]; then
   python setup.py install
else 
   #use cached wheel or something
fi

[pytorch-probot]

CI Flow Status

⚛️ CI Flow

Ruleset - Version: v1
Ruleset - File: https://github.com/janeyx99/pytorch/blob/1974d86376d5503525f91c4c5b87d875f4d8ea61/.github/generated-ciflow-ruleset.json
PR ciflow labels: ciflow/default

Workflows	Labels (bold enabled)	Status
Triggered Workflows
linux-bionic-py3.8-gcc9-coverage	ciflow/all, ciflow/coverage, ciflow/cpu, ciflow/default, ciflow/linux	✅ triggered
linux-xenial-cuda11.3-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/default, ciflow/linux	✅ triggered
linux-xenial-py3.6-gcc5.4	ciflow/all, ciflow/cpu, ciflow/default, ciflow/linux	✅ triggered
linux-xenial-py3.6-gcc7-bazel-test	ciflow/all, ciflow/bazel, ciflow/cpu, ciflow/default, ciflow/linux	✅ triggered
win-vs2019-cpu-py3	ciflow/all, ciflow/cpu, ciflow/default, ciflow/win	✅ triggered
win-vs2019-cuda10.1-py3	ciflow/all, ciflow/cuda, ciflow/default, ciflow/win	✅ triggered
Skipped Workflows
libtorch-linux-xenial-cuda10.2-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/libtorch, ciflow/linux	🚫 skipped
libtorch-linux-xenial-cuda11.3-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/libtorch, ciflow/linux	🚫 skipped
linux-bionic-cuda10.2-py3.9-gcc7	ciflow/all, ciflow/cuda, ciflow/linux, ciflow/slow	🚫 skipped
linux-xenial-cuda10.2-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/linux, ciflow/slow	🚫 skipped
periodic-libtorch-linux-xenial-cuda11.1-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/libtorch, ciflow/linux, ciflow/scheduled	🚫 skipped
periodic-linux-xenial-cuda11.1-py3.6-gcc7	ciflow/all, ciflow/cuda, ciflow/linux, ciflow/scheduled	🚫 skipped
periodic-win-vs2019-cuda11.1-py3	ciflow/all, ciflow/cuda, ciflow/scheduled, ciflow/win	🚫 skipped
win-vs2019-cuda11.3-py3	ciflow/all, ciflow/cuda, ciflow/win	🚫 skipped

You can add a comment to the PR and tag @pytorchbot with the following commands:

# ciflow rerun, "ciflow/default" will always be added automatically
@pytorchbot ciflow rerun

# ciflow rerun with additional labels "-l <ciflow/label_name>", which is equivalent to adding these labels manually and trigger the rerun
@pytorchbot ciflow rerun -l ciflow/scheduled -l ciflow/slow

For more information, please take a look at the CI Flow Wiki.

[facebook-github-bot]

🔗 Helpful links

• 🧪 See artifacts and rendered test results at hud.pytorch.org/pr/64314

💊 CI failures summary and remediations

As of commit 1974d86 (more details on the Dr. CI page):

---

💚 💚 Looks good so far! There are no failures yet. 💚 💚

---

This comment was automatically generated by Dr. CI (expand for details).

Follow this link to opt-out of these comments for your Pull Requests.

Please report bugs/suggestions to the (internal) Dr. CI Users group.

Click here to manually regenerate this comment.

[codecov]

Codecov Report

Merging #64314 (1974d86) into master (968d7ee) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #64314      +/-   ##
==========================================
+ Coverage   66.67%   66.71%   +0.04%     
==========================================
  Files         705      705              
  Lines       92171    92227      +56     
==========================================
+ Hits        61453    61530      +77     
+ Misses      30718    30697      -21     

[facebook-github-bot]

@janeyx99 has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[facebook-github-bot]

@janeyx99 merged this pull request in aeafcde.