add release build entrypoint

Author: TravisEz13

tools/releaseBuild/vstsbuild.ps1

@@ -0,0 +1,55 @@
+param(
+    [ValidateSet('win')]
+    [String]
+    $Name
+)
+
+$ErrorActionPreference = 'Stop'
+
+$psReleaseBranch = 'master'
+$psReleaseFork = 'PowerShell'
+$location = Join-Path -Path $PSScriptRoot -ChildPath 'PSRelease'
+if(Test-Path $location)
+{
+    Remove-Item -Path $location -Recurse -Force
+}
+
+$gitBinFullPath = (Get-Command -Name git).Source
+if (-not $gitBinFullPath)
+{
+    throw "Git is required to proceed. Install from 'https://git-scm.com/download/win'"
+}
+
+Write-Verbose "cloning -b $psReleaseBranch --quiet https://github.com/$psReleaseFork/PSRelease.git" -verbose
+& $gitBinFullPath clone -b $psReleaseBranch --quiet https://github.com/$psReleaseFork/PSRelease.git $location
+
+Push-Location -Path $PWD.Path
+try{
+    Set-Location $location
+    & $gitBinFullPath  submodule update --init --recursive --quiet
+}
+finally
+{
+    Pop-Location
+}
+
+$unresolvedRepoRoot = Join-Path -Path $PSScriptRoot '../..'
+$resolvedRepoRoot = (Resolve-Path -Path $unresolvedRepoRoot).ProviderPath
+
+try
+{
+    Write-Verbose "Starting build at $resolvedRepoRoot  ..." -Verbose
+    Import-Module "$location/vstsBuild" -Force
+    Import-Module "$location/dockerBasedBuild" -Force
+    Clear-VstsTaskState
+
+    Invoke-Build -RepoPath $resolvedRepoRoot  -BuildJsonPath './tools/releaseBuild/build.json' -Name $Name -Parameters $PSBoundParameters
+}
+catch
+{
+    Write-VstsError -Error $_
+}
+finally{
+    Write-VstsTaskState
+    exit 0
+}