chore: Update to the latest devcontainer image

chore: Install CSpell if needed
feat: Add VS Code tasks to run CSpell locally

Author: deadlydog

.cspell.json

@@ -10,7 +10,9 @@
 		"**/_.gitignore",
 		"**/devcontainer.json",
 		"**/build-and-test-powershell-module.yml",
-		"**/build-test-and-deploy-powershell-module.yml"
+		"**/build-test-and-deploy-powershell-module.yml",
+		"**/bin/**", // Ignore C# build output files.
+		"**/obj/**" // Ignore C# build output files.
 	],
 	"words": [
 		"behaviour",

.devcontainer/devcontainer.json

@@ -3,7 +3,7 @@
 {
 	"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",
@@ -13,8 +13,9 @@
 		}
 	},
 
-	// 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": {

.gitignore

@@ -1,3 +1,9 @@
+# Custom additions:
+
+# Ignore NPM files.
+package-lock.json
+package.json
+
 # Created by https://www.toptal.com/developers/gitignore/api/powershell,visualstudiocode,visualstudio
 # Edit at https://www.toptal.com/developers/gitignore?templates=powershell,visualstudiocode,visualstudio
 

.vscode/tasks.json

@@ -9,7 +9,8 @@
 				"isDefault": true
 			},
 			"dependsOn": [
-				"Run PSScriptAnalyzer linter"
+				"Run PSScriptAnalyzer linter",
+				"Run CSpell spell checker"
 			]
 		},
 		{
@@ -46,6 +47,31 @@
 				"$func-powershell-watch"
 			]
 		},
+		{
+			"label": "Run CSpell spell checker",
+			"type": "shell",
+			"options": {
+				"shell": {
+					"executable": "pwsh",
+					"args": [
+						"-NoProfile",
+						"-Command"
+					]
+				}
+			},
+			// If npx is not available, warn that Node.js is not installed. If we cannot run cspell, try to install and run it, and warn if we still cannot run it.
+			"command": "try { & npx -v > $null } catch {}; if (-not $?) { Write-Warning 'Node.js is not installed, so cannot download and run npx cspell.' } else { try { & npx cspell . } catch {}; if (-not $?) { & npm install cspell; & npx cspell . }; if (-not $?) { Write-Warning 'There was a problem installing or running cspell' } }",
+			"group": "build",
+			"presentation": {
+				"reveal": "always",
+				"panel": "dedicated",
+				"clear": true,
+				"group": "build"
+			},
+			"problemMatcher": [
+				"$func-powershell-watch"
+			]
+		},
 		{
 			"label": "Run all Pester tests",
 			"type": "shell",

src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.cspell.json

@@ -7,7 +7,8 @@
 	"language": "en",
 	"ignorePaths": [
 		".devcontainer/devcontainer.json",
-		".github/workflows/*.yml"
+		".github/workflows/*.yml",
+		".gitignore"
 	],
 	"words": [
 		"behaviour",