CI: add a zlib leg to extensions job

[Haven-Maple]

Summary

• Add zlib1g-dev to the shared dev/CI image.
• Build the zlib variant and run the full suite in the extensions job.

Testing

• make zlib
• cd tests && bash run_all_tests.sh
  • 3204/3204 passed
  • DEFLATE Codecs: 22 checks passed

[InauguralPhysicist]

Thanks so much for this, @Haven-Maple — and welcome! 🎉 This is a genuinely well-targeted first contribution: it closes a real gap by giving the DEFLATE builtins (#684/#693) full-suite CI coverage instead of just the minimal-build stub check. I read through the whole diff and verified it against main — the make zlib target, the DEFLATE section [124], and the scope gate all line up, and zlib1g-dev lands in exactly the image the extensions job builds against.

Your PR was a first-time contribution, so CI was held for approval — I've approved it and the full matrix (macOS, tsan, valgrind, plus the new zlib leg) is running now. Assuming it comes back green, this is good to merge as-is.

If you're enjoying EigenScript, a ⭐ on the repo would mean a lot and helps other people find the project. Hope to see more from you!

[InauguralPhysicist]

Shipped! 🚀 Your change is now on main in ba9b335, with your authorship preserved.

Quick note on why this shows as closed-via-#700 rather than merged directly: your PR was completely correct — every CI leg passed except the new make zlib step, which hit a fork-PR bootstrap quirk. Fork PRs run inside our rolling base CI image and can't publish a new image built from their own Dockerfile, so the zlib1g-dev you correctly added never made it into the image that leg built against (zlib.h: No such file or directory). Relanding the identical commit from an internal branch let the CI image rebuild with your Dockerfile change, and then the full zlib leg — DEFLATE section [124], all 22 checks — went green.

So: nothing to fix on your end, this was purely a CI-plumbing constraint on fork PRs. Really nice first contribution, and thank you again — hope to see you back in the tracker! ⭐