Switch markdownlint GH action to use super-linter (#5809)

.github/linters/.markdown-lint.yml

@@ -0,0 +1,5 @@
+default: true
+MD013: false # line length
+MD024: # no-duplicate-heading Multiple headings with the same content
+  siblings_only: true
+MD033: false # no inline HTML

.github/workflows/lint-code-base.yml

@@ -0,0 +1,31 @@
+name: Lint Code Base
+
+on:
+  pull_request: null
+
+permissions: {}
+
+jobs:
+  run-lint:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: read
+      # To report GitHub Actions status checks
+      statuses: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          # Full git history is needed to get a proper list of changed files within `super-linter`
+          fetch-depth: 0
+      - name: Lint Code Base
+        uses: github/super-linter@v6 # https://github.com/github/super-linter
+        env:
+          DEFAULT_BRANCH: main
+          FILTER_REGEX_EXCLUDE: eng/common/.*|eng/readme-templates/.*
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_ALL_CODEBASE: false
+          VALIDATE_MARKDOWN: true

samples/aspnetapp/README.md

@@ -81,7 +81,7 @@ You may notice that the sample includes a [health check](https://learn.microsoft
 
 ## Build image with the SDK
 
-The easiest way to [build images is with the SDK](https://github.com/dotnet/sdk-container-builds). 
+The easiest way to [build images is with the SDK](https://github.com/dotnet/sdk-container-builds).
 
 ```console
 dotnet publish /p:PublishProfile=DefaultContainer

samples/releasesapi/README.md

@@ -1,6 +1,6 @@
 # Release Json Report API
 
-This app demonstrates publishing an app as [native AOT](https://learn.microsoft.com/dotnet/core/deploying/native-aot/) in containers. 
+This app demonstrates publishing an app as [native AOT](https://learn.microsoft.com/dotnet/core/deploying/native-aot/) in containers.
 
 > [!NOTE]
 > The base images used by this sample are in preview.
@@ -23,7 +23,7 @@ It exposes two endpoints:
 
 ## App
 
-The app is intended as a sort of compliance report for .NET. The report includes supported major releases and those recently out of support. It includes the latest and latest security patch versions for each of those major releases. 
+The app is intended as a sort of compliance report for .NET. The report includes supported major releases and those recently out of support. It includes the latest and latest security patch versions for each of those major releases.
 
 This same information is available from the [release JSON](https://github.com/dotnet/core/blob/main/release-notes/releases-index.json) files that the team maintains, but that requires a bit of code to provide the same report.