With this change, you can now use the `dev` tag of `@pulumi/pulumi` to
get the latest version of the SDK and install it from get.pulumi.com
This is helpful for some of our internal testing.
Previously, we published builds to rel.pulumi.com and only put actual
released builds (eg. rc's and final builds) on get.pulumi.com. We
should just publish all of the SDK builds to get.pulumi.com.
This also makes a slight tweak to the filename of the package we
upload (we took the switch over to get.pulumi.com to make this change
and now that we are uploading automatically, we need to encode this
change instead of doing it by hand).
