Migrate "beam_PreCommit_Java_Examples_Dataflow" Jenkins job to Github Actions

[andreydevyatkin]

The following jenkins jobs have been migrated:

• https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Commit/
• https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Cron/
• https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Phrase/

How has it been tested?

The job has been tested on Self-hosted GKE runners ubuntu 20.04.
The following test cases are passed:

• by creating pull requests with changes in trigger paths
• by adding a comment to the PR
• by making a push

---

Thank you for your contribution! Follow this checklist to help us incorporate your contribution quickly and easily:

• Mention the appropriate issue in your description (for example: addresses #123), if applicable. This will automatically add a link to the pull request in the issue. If you would like the issue to automatically close on merging the pull request, comment fixes #<ISSUE NUMBER> instead.
• Update CHANGES.md with noteworthy changes.
• If this contribution is large, please file an Apache Individual Contributor License Agreement.

See the Contributor Guide for more tips on how to make review process smoother.

To check the build health, please visit https://github.com/apache/beam/blob/master/.test-infra/BUILD_STATUS.md

GitHub Actions Tests Status (on master branch)

See CI.md for more information about GitHub Actions CI.

[github-actions]

Assigning reviewers. If you would like to opt out of this review, comment assign to next reviewer:

R: @Abacn for label build.

Available commands:

• stop reviewer notifications - opt out of the automated review tooling
• remind me after tests pass - tag the comment author after tests pass
• waiting on author - shift the attention set back to the author (any comment or push by the author will return the attention set to the reviewers)

The PR bot will only process comments in the main thread (not review comments).

[codecov]

Codecov Report

Merging #27233 (ea0606c) into master (71cb3ca) will increase coverage by 0.01%.
The diff coverage is n/a.

❗ Current head ea0606c differs from pull request most recent head 16c2122. Consider uploading reports for the commit 16c2122 to get more accurate results

@@            Coverage Diff             @@
##           master   #27233      +/-   ##
==========================================
+ Coverage   71.06%   71.07%   +0.01%     
==========================================
  Files         858      858              
  Lines      104105   104105              
==========================================
+ Hits        73979    73993      +14     
+ Misses      28578    28564      -14     
  Partials     1548     1548              

Flag	Coverage Δ
python	80.28% <ø> (+0.02%)	⬆️

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see 5 files with indirect coverage changes

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[damccorm]

Thanks!