The logic to append the `+dirty` tag to a generated version on Windows
was incorrect in the case where we were producing a version for a
tagged build. In that case we would append `+dirty` when the work tree
was clean and not append it when it was dirty.
Under our old versioning system, when we started a new point release,
we'd tag the HEAD commit of master with a tag like `v0.16.6-dev` and
our scripts would use this to generate a new version number. This
required a great deal of gymnastics when producing a release and
caused us to litter these -dev tags everywhere.
To improve this, we change version number generation to the following
strategy:
1. If the commit we are building has a tag applied to it, use that tag
as the version (appending the dirty bit metadata to the version, if
needed).
2. If the commit we are bulding does not have a tag applied to it,
take the version from the next reachable tag, increment the patch
version and then append the `-dev` pre-release tag. As part of this,
we also make a slight tweek to our semver generation such that instead
of `-dev<TIMESTAMP>` we use `-dev.<TIMESTAMP>` which is more in line
with what semver recommends.
After the move to stop including packages in the SDK, we no longer
published an SDK per build. This corrects this. Since the only things
in the SDK today are the language plugins and the CLI itself, we can
publish an SDK per build from pulumi/pulumi.
This change re-uses the existing infrastructure we have in
pulumi/sdk.
Fixes#1076
