Generalize arch and Julia version testing in CI

[icweaver]

Note to self:

• arch: [CI] Don't force architecture incorrectly, use 'default' Photometry.jl#90 (comment) (x64 --> default)
• version tests: Split out nightly tests? JuliaAstro.github.io#157 (comment) (min, 1, and pre)

Packages

julia> using JuliaAstroDocs

julia> packages = filter(x -> occursin("JuliaAstro", x.repo), JuliaAstroDocs.ecosystem_t());

julia> for (name, repo) in zip(packages.name, packages.repo)
           println("- [ ] [", name, "](", repo, ")")
       end

julia> sort!(packages; by = x -> x.name);

• ASDF2.jl
• AstroAngles.jl
• AstroImages.jl CI fixup AstroImages.jl#70
• AstroLib.jl
• AstroTime.jl
• Astroalign.jl
• BoxLeastSquares.jl
• CALCEPH.jl
• CCDReduction.jl
• CFITSIO.jl
• Cosmology.jl
• DustExtinction.jl
• ERFA.jl
• EarthOrientation.jl
• EphemerisSources.jl
• FITSIO.jl
• GeneralAstrodynamics.jl
• Healpix.jl
• LACosmic.jl
• LombScargle.jl
• Orbits.jl
• PSFModels.jl
• Photometry.jl
• Reproject.jl
• SAOImageDS9.jl
• SPICE.jl
• SkyCoords.jl
• Spectra.jl
• Transits.jl
• UnitfulAstro.jl
• WCS.jl
• XPA.jl