Add editorconfig-checker workflow

Add yml style to editorconfig
Add markdown styling to editorconfig

Signed-off-by: Christian König <ckoenig@posteo.de>

.editorconfig

@@ -12,3 +12,9 @@ indent_size = tab
 tab_width = 4
 charset = utf-8
 trim_trailing_whitespace = true
+
+[*.yml]
+tab_width = 2
+
+[*.md]
+tab_width = 2

.github/workflows/editorconfig-checker.yml

@@ -0,0 +1,14 @@
+name: editorconfig-checker
+
+on:
+    pull_request:
+    push:
+
+jobs:
+    build:
+      name: editorconfig-checker
+      runs-on: ubuntu-20.04
+      steps:
+        - uses: actions/checkout@v3
+        - uses: editorconfig-checker/action-editorconfig-checker@main
+        - run: editorconfig-checker

CONTRIBUTING.md

@@ -3,5 +3,3 @@
 Please read and understand the contribution guide before creating an issue or pull request.
 
 The guide can be found here: [https://docs.pi-hole.net/guides/github/contributing/](https://docs.pi-hole.net/guides/github/contributing/)
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