This Azure Pipelines setup compiles and tests Wasmtime for Linux, macOS, and Windows.
If the CI run was triggered by a new tag being created, a new release for that tag is created with a changelog relative to the last tag release and archives of the builds for all platforms.
If the CI run was triggered by new commits landing on `master`, the release `latest-master` is updated with a new changelog relative to the last tag release and archives of the new builds for all platforms.
Note: This PR also contains changes to disable a bunch of tests on Windows, which are failing due to issues with signal handling.
