chore: Use manifest ubuntu image for non-platform specific compose services

[paleolimbot]

Before, running docker compose run --rm docs crashed because pandoc doesn't work with docker's emulation for whatever reason. Now that the manifest image works, we can use it for those types of workflows (I left out verify because that one should pretty much always be platform-specific).

[codecov-commenter]

Codecov Report

Merging #275 (3f8d4f5) into main (3157182) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   87.19%   87.15%   -0.04%     
==========================================
  Files          66       63       -3     
  Lines       10128     9771     -357     
==========================================
- Hits         8831     8516     -315     
+ Misses       1297     1255      -42     

see 3 files with indirect coverage changes

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