update devcontainer

Signed-off-by: paule96 <[email protected]>

Author: paule96

.devcontainer/devcontainer.json

@@ -13,8 +13,9 @@
 		"ghcr.io/devcontainers/features/docker-from-docker:1": {
 			"version": "20.10"
 		},
-		"ghcr.io/devcontainers/features/dotnet:1": {
-			"version": "6.0"
+		"ghcr.io/devcontainers/features/dotnet": {
+			"version": "6.0",
+			"additionalVersions": ["7.0", "8.0"]
 		},
 		"ghcr.io/devcontainers/features/github-cli:1": {
 			"version": "2"
@@ -32,7 +33,8 @@
 		"ms-dotnettools.csharp",
 		"ms-dotnettools.vscode-dotnet-runtime",
 		"ms-azuretools.vscode-dapr",
-		"GitHub.copilot"
+		"GitHub.copilot",
+		"ms-dotnettools.csdevkit"
 	],
 	"forwardPorts": [
 		3000,