[PR] [SPARK-57755][INFRA] Replace deprecated `apt-key` with `/etc/apt/trusted.gpg.d` keyring file [spark]

["dongjoon-hyun (via GitHub)" <gi...@apache.org>]

dongjoon-hyun opened a new pull request, #56868:
URL: https://github.com/apache/spark/pull/56868

   ### What changes were proposed in this pull request?
   
   This PR replaces the deprecated `apt-key add` with a keyring file under
   `/etc/apt/trusted.gpg.d/` in three dev Dockerfiles
   (`dev/create-release/spark-rm/Dockerfile.base`, `dev/infra/Dockerfile`,
   `dev/spark-test-image/sparkr/Dockerfile`):
   
   ```diff
   -RUN gpg -a --export E084DAB9 | apt-key add -
   +RUN gpg -a --export E084DAB9 > /etc/apt/trusted.gpg.d/cran.asc
   ```
   
   ### Why are the changes needed?
   
   `apt-key` is deprecated and removed at `Ubuntu 26.04`. The official manpage
   recommends shipping keyring files in `/etc/apt/trusted.gpg.d/` directly instead.
   
   - https://manpages.debian.org/testing/apt/apt-key.8.en.html
   - https://manpages.ubuntu.com/manpages/jammy/en/man8/apt-key.8.html
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   Manually built the images and verified the CRAN repository still works.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Generated-by: Claude Opus 4.8


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Re: [PR] [SPARK-57755][INFRA] Replace deprecated `apt-key` with `/etc/apt/trusted.gpg.d` keyring file [spark]

["dongjoon-hyun (via GitHub)" <gi...@apache.org>]

dongjoon-hyun commented on PR #56868:
URL: https://github.com/apache/spark/pull/56868#issuecomment-4836344729

   Could you review this when you have some time, @MaxGekk ?


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