Add bootstrap script for messing with a manually-started instance

etc/taskcluster/windows/bootstrap.ps1

@@ -0,0 +1,55 @@
+# Use this script is to get a build environment
+# when booting a Windows EC2 instance outside of Taskcluster.
+
+
+[Environment]::SetEnvironmentVariable("Path", $env:Path +
+    ";C:\git\cmd;C:\python2;C:\python2\Scripts;C:\Users\Administrator\.cargo\bin",
+    [EnvironmentVariableTarget]::Machine)
+[Environment]::SetEnvironmentVariable("Lib", $env:Lib +
+    ";C:\gstreamer\1.0\x86_64\lib",
+    [EnvironmentVariableTarget]::Machine)
+
+
+# Optional
+$client.DownloadFile(
+    "http://download.tuxfamily.org/dvorak/windows/bepo.exe",
+    "C:\bepo.exe"
+)
+
+
+# use TLS 1.2 (see bug 1443595)
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+
+# For making http requests
+$client = New-Object system.net.WebClient
+$shell = new-object -com shell.application
+
+# Download a zip file and extract it
+function Expand-ZIPFile($file, $destination, $url)
+{
+    $client.DownloadFile($url, $file)
+    $zip = $shell.NameSpace($file)
+    foreach($item in $zip.items())
+    {
+        $shell.Namespace($destination).copyhere($item)
+    }
+}
+
+md C:\git
+Expand-ZIPFile -File "C:\git.zip" -Destination "C:\git" -Url `
+    "https://github.com/git-for-windows/git/releases/download/v2.19.0.windows.1/MinGit-2.19.0-64-bit.zip"
+
+$client.DownloadFile(
+    "https://static.rust-lang.org/rustup/archive/1.13.0/i686-pc-windows-gnu/rustup-init.exe",
+    "C:\rustup-init.exe"
+)
+
+Start-Process C:\rustup-init.exe -Wait -NoNewWindow -ArgumentList `
+    "--default-toolchain none -y"
+
+md C:\python2
+Expand-ZIPFile -File "C:\python2.zip" -Destination "C:\python2" -Url `
+    "https://queue.taskcluster.net/v1/task/RIuts6jOQtCSjMbuaOU6yw/runs/0/artifacts/public/repacked.zip"
+
+Expand-ZIPFile -File "C:\gst.zip" -Destination "C:\" -Url `
+    "https://queue.taskcluster.net/v1/task/KAzPF1ZYSFmg2BQKLt0LwA/runs/0/artifacts/public/repacked.zip"