Add Dependabot configuration for package updates

Configure Dependabot to check for updates weekly for GitHub Actions, npm, and Docker packages.

Author: dfuchss

.github/dependabot.yml

@@ -0,0 +1,32 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+      time: "11:00"
+      timezone: "Europe/Berlin"
+    commit-message:
+      prefix: "Dependency"
+      include: "scope"
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+      time: "11:00"
+      timezone: "Europe/Berlin"
+    commit-message:
+      prefix: "Dependency"
+      include: "scope"
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "wednesday"
+      time: "11:00"
+      timezone: "Europe/Berlin"
+    commit-message:
+      prefix: "Dependency"
+      include: "scope"