Do not pollute workdir during pulumictl auto-installation #1335
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When pulumictl is not discovered in PATH it is auto-installed by the Makefile.
Unfortunately the previous method used a GOPATH override to guide
go install
as to where install pulumictl. As a side effect of this, the auto-installation did not use the standard Go package cache and polluted the working dir with another copy of Go package cache.After this change, auto installation happens against the standard Go package cache and the result is then copied into bin.
Users should prefer to have pulumictl in the environment than relying on the auto-installation.
Tested manually on pulumi-awsx.