Add pr-bot configuration for package-storage-publish pipeline

[mrodm]

This PR adds the configuration required to trigger builds in Buildkite for each pull request created or updated.

[mrodm]

This will be updated depending on the final name of the pipeline.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-02-10T11:38:59.574+0000

• Duration: 33 min 32 sec

Test stats 🧪

Test	Results
Failed	0
Passed	891
Skipped	0
Total	891

🤖 GitHub comments

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To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (35/35)	💚
Files	65.909% (87/132)	👍
Classes	61.376% (116/189)	👍
Methods	49.091% (405/825)	👍
Lines	31.742% (3578/11272)	👍 0.018
Conditionals	100.0% (0/0)	💚

[jsoriano]

Thanks!