ci: add Dependabot configuration

Assisted-by: Claude Opus 5.5

Author: PierreRaybaut

.github/dependabot.yml

@@ -0,0 +1,25 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    target-branch: develop
+    schedule:
+      interval: weekly
+    groups:
+      production:
+        dependency-type: production
+        update-types: [minor, patch]
+      development:
+        dependency-type: development
+        update-types: [minor, patch]
+    ignore:
+      # Pinned with PYODIDE_VERSION (runtime.ts, workerBase.ts) and index.html.
+      - dependency-name: pyodide
+  - package-ecosystem: github-actions
+    directory: /
+    target-branch: develop
+    schedule:
+      interval: weekly
+    groups:
+      github-actions:
+        patterns: ["*"]