feat: Install required PowerShell modules and CSpell in dev container and use latest image. Missed updating this devcontainer.json last time

Author: deadlydog

src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.devcontainer/devcontainer.json

@@ -3,18 +3,20 @@
 {
 	"name": "PowerShell",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/powershell:lts-debian-11",
+	"image": "mcr.microsoft.com/dotnet/sdk:9.0",
 	"features": {
 		"ghcr.io/devcontainers/features/common-utils:2": {
 			"installZsh": "true",
 			"username": "vscode",
 			"upgradePackages": "false",
 			"nonFreePackages": "true"
-		}
+		}//, // Uncomment this line and the one below to install the dotnet CLI.
+		//"ghcr.io/devcontainers/features/dotnet:2": "latest" // Installs the dotnet CLI.
 	},
 
-	// Set VS Code's default shell to PowerShell.
-	"postCreateCommand": "sudo chsh vscode -s \"$(which pwsh)\"",
+	// Set pwsh as the default shell for the devcontainer, install required PowerShell modules, and install NPM and CSpell.
+	// If you do not plan to use CSpell, you can remove everything after and including 'sudo apt update'.
+	"postCreateCommand": "sudo chsh vscode -s \"$(which pwsh)\"; pwsh -c \"Install-Module Pester -Force\"; pwsh -c \"Install-Module PSScriptAnalyzer -Force\"; sudo apt update; sudo DEBIAN_FRONTEND=noninteractive apt install -y npm; npm install cspell",
 
 	// Configure tool-specific properties.
 	"customizations": {