Add Check Markdown Link GH action

.github/linters/.check-markdown-links.json

@@ -0,0 +1,11 @@
+{
+    "ignorePatterns": [
+        // 500
+        {
+            "pattern": "^https://packages.ubuntu.com/search?suite=default&section=all&arch=any&keywords=dotnet&searchon=names"
+        },
+        {
+            "pattern": "^https://github.com/dotnet/sdk/tree/main/src/SourceBuild/patches"
+        }
+    ]
+}

.github/workflows/check-markdown-links.yml

@@ -0,0 +1,24 @@
+name: 'Check Markdown Links'
+
+on:
+  pull_request:
+    paths:
+      - "**/*.md"
+
+permissions:
+  pull-requests: read
+
+jobs:
+  check-markdown-links:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Check markdown links
+        uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          config-file: .github/linters/.check-markdown-links.json
+          use-quiet-mode: 'yes'
+          use-verbose-mode: 'no'

Documentation/VMR-re-bootstrapping.md

@@ -82,15 +82,15 @@ re-bootstrap the VMR:
         can try using an earlier passing build.
     1. Retrieve the built SDK version from the build.
     1. Update the dotnet version in the
-       [global.json](https://github.com/dotnet/installer/blob/main/src/SourceBuild/content/global.json).
+       [global.json](https://github.com/dotnet/sdk/blob/main/src/SourceBuild/content/global.json).
 1. Update arcade
     1. Lookup the arcade commit and version. From a VMR commit, you can find the
     corresponding arcade commit/version by looking at the
     [source-manifest.json](https://github.com/dotnet/dotnet/blob/main/src/source-manifest.json).
     1. Update the arcade SDK version in the
-       [global.json](https://github.com/dotnet/installer/blob/main/src/SourceBuild/content/global.json).
+       [global.json](https://github.com/dotnet/sdk/blob/main/src/SourceBuild/content/global.json).
     1. Update the arcade dependency commit and version in the
-       [Version.Details.xml](https://github.com/dotnet/installer/blob/main/src/SourceBuild/content/eng/Version.Details.xml).
+       [Version.Details.xml](https://github.com/dotnet/sdk/blob/main/src/SourceBuild/content/eng/Version.Details.xml).
 1. Update private source-built SDK and artifacts versions
     1. Update `PrivateSourceBuiltSdkVersion` and
        `PrivateSourceBuiltArtifactsVersion` in the

Documentation/planning/arcade-powered-source-build/README.md

@@ -214,8 +214,7 @@ A: There are two reasons to make a patch:
 [speculative-build.md]: speculative-build.md
 [intermediate-nupkg.md]: intermediate-nupkg.md
 [intermediate nupkgs]: intermediate-nupkg.md
-[onboarding/local-onboarding.md#patching]:
-    onboarding/local-onboarding.md#patching
+[onboarding/local-onboarding.md#patching]:onboarding/local-onboarding.md#patching
 
 ---
 

Documentation/planning/multi-sdk-band-support.md

@@ -23,7 +23,7 @@ feature](https://github.com/dotnet/arcade/blob/main/Documentation/UnifiedBuild/V
   functionality. Examples include
   [runtime](https://github.com/dotnet/dotnet/tree/main/src/runtime),
   [roslyn](https://github.com/dotnet/dotnet/tree/main/src/roslyn) or
-  [installer](https://github.com/dotnet/dotnet/tree/main/src/installer).
+  [sdk](https://github.com/dotnet/dotnet/tree/main/src/sdk).
 - **Previously source-built (PSB)** - Artifacts from a previous
   servicing/preview iteration, or from a bootstrap build. These may be used when
   building the current dotnet VMR branch, but may not be bundled into any