Linkerd CLI Chocolatey Package (#4205)

* Add Linkerd CLI Chocolatey Package

This PR partially fixes #3063 by building a chocolatey package for Linkerd2's Windows CLI
It adds the build scripts for the Linkerd chocolatey package and based on discussions in
https://github.com/linkerd/linkerd2/pull/3921

Signed-off-by: Animesh Narayan Dangwal <animesh.leo@gmail.com>

.github/workflows/static_checks.yml

@@ -113,4 +113,6 @@ jobs:
         ! -name test-scale \
         ! -name update-go-deps-shas \
         ! -name web \
+        ! -name *.nuspec \
+        ! -name *.ps1 \
         | xargs -I {} bin/shellcheck -x {}

bin/win/linkerd.nuspec

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2015/06/nuspec.xsd">
+  <metadata>
+    <id>linkerd</id>
+    <version>${LINKERD_VERSION}</version>
+    
+    <title>Linkerd</title>
+    <authors>Linkerd</authors>
+    <summary>Ultralight service mesh for Kubernetes and beyond</summary>
+    <description>
+    Linkerd is an ultralight service mesh for Kubernetes. 
+    It gives you observability, reliability, and security without requiring any code changes.
+
+    Package Parameters
+    - `path`: Specify path for linkerd-cli installation. If not specified, uses environment variable `linkerdPath`. Uses default chocolatey install path if none provided. 
+    - `checksum`: Specify the checksum for linkerd-cli. If not specified, uses environment variable `linkerdCheckSum`. Defaults to `null` if no checksum provided and skips verification. Do ensure to use the correct checksum for the version of install. 
+    </description>
+
+    <projectUrl>https://github.com/linkerd/linkerd2</projectUrl>
+    <licenseUrl>https://github.com/linkerd/linkerd2/blob/master/LICENSE</licenseUrl>
+    <releaseNotes>https://github.com/linkerd/linkerd2/releases</releaseNotes>
+    <docsUrl>https://linkerd.io/docs</docsUrl>
+
+    <dependencies>
+      <dependency id="chocolatey-core.extension" version="1.1.0" />
+    </dependencies>
+  </metadata>
+
+  <files>
+    <file src="bin\win\tools\**" target="tools" />
+    </files>
+</package>

bin/win/tools/chocolateyinstall.ps1

@@ -0,0 +1,33 @@
+$ErrorActionPreference = 'Stop';
+$toolsPath = "$(Split-Path -parent $MyInvocation.MyCommand.Definition)"
+
+$version = $env:chocolateyPackageVersion
+$pp = Get-PackageParameters
+
+if ($null -ne $pp['path']){
+	$lpath = $pp['path']
+}
+elseif (Test-Path env:linkerdPath) {
+	$lpath = $env:linkerdPath
+}
+else {
+	$lpath = $toolsPath
+}
+
+if ($null -ne $pp['checksum']){
+	$checksum = $pp['checksum']
+}
+else{
+	$checksum = $env:linkerdCheckSum
+}
+
+$packageArgs = @{
+  packageName    = 'linkerd'
+  fileFullPath   = "$lpath\linkerd.exe"
+  url64          = "https://github.com/linkerd/linkerd2/releases/download/stable-$version/linkerd2-cli-stable-$version-windows.exe"
+  checksum       = $checksum
+  checksumType   = 'sha256'
+}
+
+Get-ChocolateyWebFile @packageArgs
+Install-ChocolateyPath $packageArgs.fileFullPath 'User'