Garden Windows Tools BOSH Release

This provides golang for windows, at a version that the garden team can control. It is used in the concourse deployment, to supply golang to the windows-worker.

How to bump golang

1. Download the latest golang for windows from https://golang.org/dl/
2. bosh add-blob ./go$VERSION.windows.amd64.zip golang-1-windows/go$VERSION.windows-amd64.zip
3. Update packages/golang-1-windows/packaging and packages/golang-1-windows/spec to refer to the new golang version
4. Remove the old blob: bosh remove-blob golang-1-windows/go$OLD_VERSION.windows.amd64.zip
5. Run ./scripts/release.sh to create a new release
6. Update the garden-windows-tools release version and URL in the concourse windows ops file.