devcontainer: inital config

This adds a devcontainer config for devs to have an easy way to get a working dev environment.

.github/dependabot.yml

@@ -1,3 +1,9 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for more information:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+# https://containers.dev/guide/dependabot
+
 version: 2
 updates:
 - package-ecosystem: npm
@@ -9,3 +15,7 @@ updates:
   - dependency-name: "@types/node"
     versions:
     - ">= 19.a"
+ - package-ecosystem: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly