Update devcontainer.json and add Dependabot for devcontainer's version updates (#1742)

* Update devcontainer.json

Fix Java Version issues and avoid additional work in changing Java versions and SDK versions.

Preinstalls pnpm, yarn, nvm, and node.js to LTS. Along with the Android SDK platform at `35` and build tools at `35.0.0`

* Create dependabot.yml

Author: UnschooledGamer

.devcontainer/devcontainer.json

@@ -1,6 +1,43 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/java
 {
-	"image": "mcr.microsoft.com/devcontainers/universal:2",
+	"name": "Java",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/java:1-21-bullseye",
+
 	"features": {
-		"ghcr.io/nordcominc/devcontainer-features/android-sdk:1": {}
+		"ghcr.io/devcontainers/features/java:1": {
+			"installGradle": true,
+			"installGroovy": false,
+			"installMaven": false,
+			"installAnt": false,
+			"version": "21",
+			"jdkDistro": "ms",
+			"gradleVersion": "latest",
+			"mavenVersion": "none"
+		},
+		"ghcr.io/nordcominc/devcontainer-features/android-sdk:1": {
+			"platform": "35",
+			"build_tools": "35.0.0"
+		},
+		"ghcr.io/devcontainers/features/node:1": {
+			"nodeGypDependencies": false,
+			"installYarnUsingApt": false,
+			"version": "lts",
+			"pnpmVersion": "latest",
+			"nvmVersion": "latest"
+		}
 	}
-}
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "java -version",
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

.github/dependabot.yml

@@ -0,0 +1,12 @@
+# 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: "devcontainers"
+   directory: "/"
+   schedule:
+     interval: weekly