Add GitHub workflow to build rbxm and publish to pesde and wally

[alicesaidhi]

This PR implements two release workflows.

build.yml contains a workflow that will build a build.rbxm and add it to the latest github release. wallypesde.yml contains a workflow that will publish the package to both pesde and wally.

In order for the wallypesde.yml workflow to work, you need to add the following secrets to your repository: WALLY_TOKEN: This secret should be the token stored inside %userprofile%/.wally/auth.toml PESDE_TOKEN This secret is given by running pesde auth token