Add dependabot (#85)

It automates dependency updates and saves us work

Author: lurtz

.github/dependabot.yml

@@ -0,0 +1,34 @@
+---
+# *******************************************************************************
+# Copyright (c) 2026 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) distributed with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made available under the
+# terms of the Apache License Version 2.0 which is available at
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# SPDX-FileCopyrightText: 2026 Contributors to the Eclipse Foundation
+# SPDX-License-Identifier: Apache-2.0
+# *******************************************************************************
+
+version: 2
+updates:
+  # GitHub Actions
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+
+  # Docker base images
+  - package-ecosystem: docker
+    directory: /
+    schedule:
+      interval: daily
+
+  # DevContainer
+  - package-ecosystem: devcontainers
+    directory: /
+    schedule:
+      interval: daily