ci: added dependabot

Author: simonwalz

.github/dependabot.yml

@@ -0,0 +1,26 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: ".github/workflows/"
+    schedule:
+      interval: "weekly"
+    assignees:
+      - "simonwalz"
+  - package-ecosystem: "docker"
+    directory: "/system"
+    schedule:
+      interval: "daily"
+    assignees:
+      - "simonwalz"
+  - package-ecosystem: "docker"
+    directory: "/updater"
+    schedule:
+      interval: "daily"
+    assignees:
+      - "simonwalz"
+  - package-ecosystem: "docker"
+    directory: "/image-factory"
+    schedule:
+      interval: "daily"
+    assignees:
+      - "simonwalz"