github/workflows: add editorconfig linting

[Akemi]

alternative or additional to #15132
follow up of #15124

IndentSize disabled because it checks all indentation for multiple of indent_size, so spaces for alignment error too.
MaxLineLength disabled because we don't have a hard limit on 80, many/some files also go over 100, disabled in other linters too.
excluding osdep/dirent-win.h since it's a straight copy and we decided to keep it as is.

this checks all files like defined in our .editorconfig and not just c-family files like clang-format(?).

in the upcoming release (3.1) they deprecated the .ecrc file in favour of the newly added .editorconfig-checker.json. so i decided to use the new one instead (it's not auto discovered yet with the current version). the upcoming release will also add github-actions formatting, so errors will also be displayed in the code/diff view of the PR similar to the swift linting. added this to the config file already, it is ignored with the current version.

will fix the two remaining errors either here, if we decide to go with this, or in a separate PR.

@kasper93 i hope you don't mind this.

[github-actions]

Download the artifacts for this pull request:

Windows

• mpv-i686-w64-mingw32
• mpv-x86_64-w64-mingw32
• mpv-x86_64-windows-msvc

macOS

• mpv-macos-13-intel
• mpv-macos-14-arm
• mpv-macos-15-arm

[Akemi]

seems like the go install command doesn't install the binary globally. probably because the GOBIN env var is not set? trying a few things now.

[Akemi]

instead of the setup-go action we could also just call ~/go/bin/editorconfig-checker. go install seems to install it to the home directory (~/go/bin/) by default/in our case.

had to exclude the TOOLS/osxbundle/mpv.app/Contents/PkgInfo too, since it seems to be expected to have no new newline at the end of the file.

[kasper93]

instead of the setup-go action we could also just call ~/go/bin/editorconfig-checker. go install seems to install it to the home directory (~/go/bin/) by default/in our case.

Is this maybe equivalent to $GOBIN/editorconfig-checker?

EDIT: If install works without setup-go, it should already have GOBIN defined IIRC. So we can try to call directly.

[Akemi]

sadly $GOBIN/editorconfig-checker doesn't work either https://github.com/mpv-player/mpv/actions/runs/11449449084/job/31855050027?pr=15135

[Akemi]

alternative GOBIN=/usr/local/bin/ go install?

[edit]
or would you prefer me using this action instead. it's the official one of the editorconfig-checker org, which makes me much more comfortable. it's a lot more widely used. tbh i meant to use this one but had the other one still open in another tab and ended up copying the wrong one. sorry for messing that one up.

[kasper93]

or would you prefer me using this action instead. it's the official one of the editorconfig-checker org

looks good, we can use that.