fix(dev-image): pgvector reccomended installs flakes pupeline

[sfreudenthaler]

Every release is currently blocked: the dev-image arm64 (QEMU) build fails on apt install postgresql-$PG_VERSION-pgvector because the recommends chain drags in networkd-dispatcher/python3-gi, whose maintainer scripts try to wire systemd-resolved inside the container and die under emulation (newly fatal after a 2026-07-29 Ubuntu noble package update; observed on release run 30495772928 / v26.07.28-01, which then skipped Release, Release-Notes, Promote-latest, and Changelog publish).

One flag: --no-install-recommends — the DB container needs pgvector, not Ubuntu's network-management stack. Also slims the image.

Closes: #36806

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https://claude.ai/code/session_012ogYXVeZsBVUHkwzdStYPJ

[claude]

Claude finished @sfreudenthaler's task in 17s —— View job

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Claude finished @sfreudenthaler's task in 27s —— View job

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Code Review

Reviewed the single-line change to docker/dev-env/Dockerfile.

Diff:

-RUN apt install -y postgresql-$PG_VERSION-pgvector
+RUN apt install -y --no-install-recommends postgresql-$PG_VERSION-pgvector

The fix is correct and minimal:

• postgresql-$PG_VERSION-pgvector is a PostgreSQL extension whose hard runtime requirements are Depends (the postgres server package), not Recommends. The --no-install-recommends flag only drops the optional recommend chain (networkd-dispatcher/python3-gi), which the DB container doesn't need — so pgvector's actual functionality is unaffected.
• It's now consistent with line 36, which already uses --no-install-recommends for the base package install.
• Slims the image as a side benefit.

New Issues

No issues found.

The scope is exactly right per the second comment (pg-base change deferred to its own PR). One pre-existing observation, not introduced by this PR and out of scope — line 42 uses apt rather than apt-get; apt prints "does not have a stable CLI interface, use with caution in scripts". Worth aligning with the surrounding apt-get calls someday, but not a blocker here.

· issue-36806-pgvector-no-recommends

[sfreudenthaler]

Extended per a repo-wide survey: every apt install in shipped Dockerfiles already used --no-install-recommends except two — the pgvector line this PR fixes, and one stray postgresql-client-16 install in docker/pg-base/Dockerfile (clearly appended after the flagged line above it). Second commit brings that one in line; the repo is now consistent.

[sfreudenthaler]

Scope reduced back to the dev-env pgvector fix only — the pg-base change moves to its own PR (with a client 16→18 bump, per RDS version survey) so backup-image changes get their own review.