Adding editorconfig-checker Github action

Check editorconfig-checker from the Github CI. Basically from this
example workflow, with minor adjustments:

https://github.com/editorconfig-checker/action-editorconfig-checker?tab=readme-ov-file#example-workflow

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
(cherry picked from commit f83a6a7f7404f833174705017b017968535c846f)
[linus.luessing@c0d3.blue: picked from gluon-packages]

Author: T-X

.github/workflows/lint.yml

@@ -30,3 +30,10 @@ jobs:
           fail_level: any
           check_all_files_with_shebangs: true
           filter_mode: nofilter
+
+  editorconfig:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: editorconfig-checker/action-editorconfig-checker@main
+      - run: editorconfig-checker