act --validate --strict fails with new `environment: deployment:` workflow setting.

[GiuseppeIII]

Github recently added a new workflow setting: https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#example-using-an-environment-without-creating-a-deployment which allows workflows to run in an environment without also creating a deployment.

Act --validate --strict currently fails here as this new property is not a part of act's workflow_schema:

Error: workflow is not valid. 'task.yml': Line: 105 Column 5: Failed to match job-factory: Line: 107 Column 7: Failed to match string: Line: 107 Column 7: Expected a scalar got mapping Line: 107 Column 7: Failed to match job-environment-mapping: Line: 108 Column 7: Unknown Property deployment

https://github.com/nektos/act/blob/master/pkg/schema/workflow_schema.json

...
    "job-environment": {
      "description": "The environment that the job references. All environment protection rules must pass before a job referencing the environment is sent to a runner.",
      "context": ["github", "inputs", "vars", "needs", "strategy", "matrix"],
      "one-of": ["string", "job-environment-mapping"]
    },
    "job-environment-mapping": {
      "mapping": {
        "properties": {
          "name": {
            "type": "job-environment-name",
            "required": true
          },
          "url": {
            "type": "string-runner-context-no-secrets",
            "description": "The environment URL, which maps to `environment_url` in the deployments API."
          }
        }
      }
    },
...

There needs to be some added property here such as:

      "mapping": {
        "properties": {
          "name": {
            "type": "job-environment-name",
            "required": true
          },
          "deployment": {
            "type": "boolean"
          },
          "url": {
            "type": "string-runner-context-no-secrets",
            "description": "The environment URL, which maps to `environment_url` in the deployments API."
          }
        }
      }