Add DevContainer configuration and post-create script

This commit introduces a new DevContainer configuration file and a post-create PowerShell script. The configuration sets up a PowerShell development environment with essential features and extensions. The post-create script automates the installation of required PowerShell modules, ensuring a smooth setup process for developers.

Thank you!

Author: jasonhorner

.devcontainer/devcontainer.json

@@ -0,0 +1,16 @@
+{
+  "name": "PowerShell Dev",
+  "features": {
+    "ghcr.io/devcontainers/features/powershell:1": {},
+    "ghcr.io/devcontainers/features/git:1": {}
+  },
+  "customizations": {
+     "extensions": [
+      "davidanson.vscode-markdownlint",
+      "ms-vscode.powershell",
+      "streetsidesoftware.code-spell-checker",
+      "redhat.vscode-yaml"
+    ]
+  },
+  "postCreateCommand": "pwsh .devcontainer/post-create.ps1"
+}

.devcontainer/post-create.ps1

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+# post-create.ps1
+
+Write-Host "Running DevContainer post-create setup..."
+
+# Ensure scripts can run
+Set-ExecutionPolicy RemoteSigned -Scope Process -Force
+
+# Install/update PSResourceGet side-by-side
+Write-Host "Installing PSResourceGet..."
+Install-Module Microsoft.PowerShell.PSResourceGet -Force -AllowClobber
+
+# Install common modules used in this environment
+$requiredModules = @(
+    "Pester",
+    "Az.Accounts"
+)
+
+Write-Host "Installing required modules..."
+foreach ($module in $requiredModules) {
+    Install-Module $module -Repository PSGallery -Force -SkipPublisherCheck -AllowClobber
+}
+
+# Validate installation
+foreach ($module in $requiredModules) {
+    if (-not (Get-Module -ListAvailable -Name $module)) {
+        Write-Warning "Module [$module] did NOT install successfully!"
+    }
+}
+
+# Display installed versions for debugging
+Write-Host "Installed module versions:"
+
+Get-Module -ListAvailable |
+    Where-Object { $_.Name -in $requiredModules + "Microsoft.PowerShell.PSResourceGet" } |
+    Sort-Object Name, Version |
+    Format-Table Name, Version, ModuleBase