feat(github-workflow): add environment.deployment property (SchemaStore#5478)

Adds support for the `deployment` property on job environment objects.
Setting to false lets a job use environment secrets and variables
without creating a deployment record. Accepts boolean or expression
syntax. Wait timers and required reviewers still apply.

Author: jdrydn

src/schemas/json/github-workflow.json

@@ -253,6 +253,19 @@
           "$comment": "https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#example-using-environment-name-and-url",
           "description": "A deployment URL",
           "type": "string"
+        },
+        "deployment": {
+          "$comment": "https://docs.github.com/en/actions/how-tos/deploy/configure-and-manage-deployments/control-deployments#using-environments-without-deployments",
+          "description": "Whether to create a deployment for this job. Setting to false lets the job use environment secrets and variables without creating a deployment record. Wait timers and required reviewers still apply.",
+          "oneOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "$ref": "#/definitions/expressionSyntax"
+            }
+          ],
+          "default": true
         }
       },
       "required": ["name"],