[jira] [Created] (FLINK-40124) Maven package cache in job_init action re-saves on every CI run instead of only when dependencies change

[Sergey Nuyanzin (Jira)]

Sergey Nuyanzin created FLINK-40124:
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             Summary:  Maven package cache in job_init action re-saves on every 
CI run instead of only when dependencies change
                 Key: FLINK-40124
                 URL: https://issues.apache.org/jira/browse/FLINK-40124
             Project: Flink
          Issue Type: Sub-task
          Components: Build System / CI
            Reporter: Sergey Nuyanzin
            Assignee: Sergey Nuyanzin


{{job_init/action.yml}}'s Maven cache key includes ${{ github.run_id }}, unique 
per run, so the primary key can never match a previous run — cache-hit is 
always false. restore-keys still restores correctly (confirmed via logs), but 
the save step then unconditionally re-uploads the full .m2 cache every run, 
even with unchanged pom.xml.

could be checked by looking into GHA logs for instance 
https://github.com/snuyanzin/flink/actions/runs/29182164397/job/86621779423
look for {{Cache saved with key}}, there is a record like
{quote}
Cache saved with key: 
Linux-ns-master-maven-03e1d3903ca1f296622d48f2fd63d6e995e49bafd35997661a78ece0ee0b726f-29098781213
{quote}



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