Able To Run `polywrap deploy` w/o `polywrap.yaml` Manifest

[dOrgJelli]

Describe the bug
Currently developers need a valid polywrap.yaml project manifest defined in order to run polywrap deploy.

Please provide the steps to reproduce and if possible a minimal demo of the problem.

• Have a wrapper URI that's pre-built (ex: /ipfs/QmfRCVA1MSAjUbrXXjya4xA9QHkbWeiKRsT7Um1cvrR7FY)
• Create a polywrap.deploy.yaml manifest that deploys the wrapper, for example:

format: 0.1.0
stages:
  ipfs_deploy:
    package: ipfs
    uri: fs/./build
    config:
      gatewayUri: "https://ipfs.wrappers.io"

• Try to run polywrap deploy in the director of polywrap.deploy.yaml, it will fail because no polywrap.yaml file is found.

Expected behavior
Users should be able to run polywrap deploy and only need a polywrap.deploy.yaml manifest defined.