introduce dependabot

Signed-off-by: Erwin <erwinkramer@hotmail.com>

Author: erwinkramer

.github/dependabot.yaml

@@ -0,0 +1,27 @@
+# Please see the documentation for more information:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://containers.dev/guide/dependabot
+
+version: 2
+updates:
+  - package-ecosystem: nuget
+    directory: /
+    schedule:
+      interval: weekly
+      day: thursday
+    groups:
+      dotnet:
+        patterns:
+          - "*"
+    ignore:
+      - dependency-name: "*"
+        update-types: ["version-update:semver-major"]
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: thursday
+    groups:
+      github-actions:
+        patterns:
+          - "*"