[related to](https://github.com/valkey-io/valkey/issues/230)
Adds workflows to build Valkey binaries and push to S3 to make it
available to download from the website
The Workflows can be triggered by pushing a release to the repo and the
other option is manually by one of the Maintainers.
Once the workflow triggers, it will generate a matrix of Jobs for the
platforms we need to build from `utils/releasetools/build-config.json`
and then the respective Jobs are triggered. These jobs make Valkey with
respect to the platform binaries we want to release and would push to a
private S3 bucket.
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Signed-off-by: Roshan Khatri <rvkhatri@amazon.com>
