Split out background submodule

[icweaver]

Doc preview: https://juliaastro.github.io/Photometry.jl/previews/PR95/

• Companion to Register BackgroundMeshes.jl#19
  • Status: New package: BackgroundMeshes v0.1.0 JuliaRegistries/General#141306

To-do

• Once that package is registered, this bit can be removed from the package Project.toml for Julia v1.10 compat

  - [sources]
  - BackgroundMeshes = {url = "https://github.com/JuliaAstro/BackgroundMeshes.jl"}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.48%. Comparing base (cde645f) to head (eb4c538).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   94.70%   93.48%   -1.22%     
==========================================
  Files          11        8       -3     
  Lines         736      599     -137     
==========================================
- Hits          697      560     -137     
  Misses         39       39              

Flag	Coverage Δ
unittests	93.48% <ø> (-1.22%)	⬇️

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[icweaver]

Alright, BackgroundMeshes.jl is registered now and things are looking green here (except for the small codecov drop, idk why it's doing that)

[cgarling]

Looking good, I don't see any issues. Thanks Ian!

[icweaver]

Thanks all! Will merge once CI has finished