ci: Test minimum cmake version in olddeps job #208

1. 
   ryanofsky commented at 2:04 pm on September 8, 2025: collaborator

   Add CI job to test minimum version of cmake that can be used to build. Current minimum version 3.12, since that’s version that added c++20 support according to #164.
2. 
   DrahtBot commented at 2:04 pm on September 8, 2025: none

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3. ci: Test minimum cmake version in olddeps job 0f580397c9
4. ryanofsky force-pushed on Sep 8, 2025
5. 
   ryanofsky commented at 2:52 pm on September 8, 2025: collaborator

   Rebased 2c6ea2eb842eb5b694923d299631862cb3a0b9f1 -> 0f580397c9135688ab02f9f1e1089b5d247bb92d (pr/oldcmake.1 -> pr/oldcmake.2, compare) to fix ctest directory errors and conflict with #207
6. hebasto approved
7. 
   hebasto commented at 3:02 pm on September 9, 2025: member

   ACK 0f580397c9135688ab02f9f1e1089b5d247bb92d, I have reviewed the code and it looks OK. CI log also looks reasonable.
8. 
   ryanofsky commented at 6:34 pm on September 9, 2025: collaborator

   Thanks for the review! Will go ahead and merge since I’m about to open another PR which depends on this
9. ryanofsky merged this on Sep 9, 2025
10. ryanofsky closed this on Sep 9, 2025

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11. ryanofsky referenced this in commit 535fa0ad0d on Sep 17, 2025
12. fanquake referenced this in commit edb871cba2 on Sep 19, 2025
13. Sjors referenced this in commit 132621fc01 on Sep 23, 2025
14. ryanofsky referenced this in commit 5bb3cbdfba on Oct 2, 2025
15. ryanofsky referenced this in commit abcd4c4ff9 on Oct 7, 2025
16. fanquake referenced this in commit a14e7b9dee on Oct 16, 2025

Contributors
ryanofsky DrahtBot hebasto