feat: add dependabot

Author: woutervanranst

.github/dependabot.yaml

@@ -0,0 +1,28 @@
+version: 2
+updates:
+  - package-ecosystem: "nuget"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+
+  - package-ecosystem: "docker"
+    directory: "/src"   # change if your Dockerfile(s) live elsewhere
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore"
+      include: "scope"