Enable dependabot for update pull requrests

.github/dependabot.yml

@@ -0,0 +1,23 @@
+# see also https://docs.github.com/en/code-security/supply-chain-security/keeping-your-dependencies-updated-automatically
+
+version: 2
+updates:
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  - package-ecosystem: "gitsubmodule"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+  - package-ecosystem: "npm"
+    directory: "/frontend"
+    schedule:
+      interval: "daily"
+      
+  - package-ecosystem: "pip"
+    directory: "/api"
+    schedule:
+      interval: "daily"