Add Dependabot configuration for .NET SDK updates

.github/dependabot.yml

@@ -1,24 +1,37 @@
-version: 2
-registries:
-  nuget-azure-devops:
-    type: nuget-feed
-    # The URL of the NuGet feed to check for updates
-    url: https://pkgs.dev.azure.com/shine-oss/Win32Metadata/_packaging/Win32Metadata-Dependencies/nuget/v3/index.json
-updates:
-  # Enable version updates for nuget
-  - package-ecosystem: "nuget"
-    # Look for NuGet dependency info from the `root` directory
-    directory: "/"
-    # Check the nuget registry for updates monthly
-    schedule:
-      interval: "monthly"
-    open-pull-requests-limit: 10
-    commit-message:
-      # Prefix all commit messages with "dependbot-security-updates: "
-      prefix: "dependbot-security-updates"
-    registries:
-      - nuget-azure-devops
-    groups:
-      nuget-dependencies:
-        dependency-type: production
-        applies-to: security-updates
+version: 2
+registries:
+  nuget-azure-devops:
+    type: nuget-feed
+    # The URL of the NuGet feed to check for updates
+
+    url: https://pkgs.dev.azure.com/shine-oss/Win32Metadata/_packaging/Win32Metadata-Dependencies/nuget/v3/index.json
+updates:
+  # Enable version updates for nuget
+  - package-ecosystem: "nuget"
+    # Look for NuGet dependency info from the `root` directory
+
+    directory: "/"
+    # Check the nuget registry for updates monthly
+
+    schedule:
+      interval: "monthly"
+    open-pull-requests-limit: 10
+    commit-message:
+      # Prefix all commit messages with "dependbot-security-updates: "
+      prefix: "dependbot-security-updates"
+    registries:
+      - nuget-azure-devops
+    groups:
+      nuget-dependencies:
+        dependency-type: production
+        applies-to: security-updates
+  - package-ecosystem: dotnet-sdk
+    directory: /
+    schedule:
+      interval: weekly
+      day: wednesday
+    ignore:
+      - dependency-name: '*'
+        update-types:
+          - version-update:semver-major
+          - version-update:semver-minor