add dependabot

Author: dfuchss

.github/dependabot.yml

@@ -0,0 +1,20 @@
+version: 2
+updates:
+    - package-ecosystem: "maven"
+      directory: "/"
+      schedule:
+          interval: "monthly"
+          time: "11:00"
+          timezone: "Europe/Berlin"
+      commit-message:
+          prefix: "Dependency"
+          include: "scope"
+    - package-ecosystem: "docker"
+      directory: "/"
+      schedule:
+          interval: "monthly"
+          time: "11:00"
+          timezone: "Europe/Berlin"
+      commit-message:
+          prefix: "Dependency"
+          include: "scope"