Allow using variables in enum fields (#2199)

## Changes

It is possible to pass variable to enum fields but json-schema doesn't
accept it. This PR adds `oneOf` for enum types that includes `${var-*}`
pattern

## Tests

Manually checked in VSCode

bundle/internal/schema/main.go

@@ -40,6 +40,19 @@ func addInterpolationPatterns(typ reflect.Type, s jsonschema.Schema) jsonschema.
 		}
 	}
 
+	// Allows using variables in enum fields
+	if s.Type == jsonschema.StringType && s.Enum != nil {
+		return jsonschema.Schema{
+			OneOf: []jsonschema.Schema{
+				s,
+				{
+					Type:    jsonschema.StringType,
+					Pattern: interpolationPattern("var"),
+				},
+			},
+		}
+	}
+
 	switch s.Type {
 	case jsonschema.ArrayType, jsonschema.ObjectType:
 		// arrays and objects can have complex variable values specified.

bundle/internal/schema/testdata/pass/job.yml

@@ -13,6 +13,8 @@ variables:
   simplevar:
     default: true
     description: "simplevar description"
+  schedule_status:
+    default: "PAUSED"
 
   complexvar:
     default:
@@ -42,6 +44,8 @@ resources:
             dependencies:
               - python=3.7
             client: "myclient"
+      trigger:
+        pause_status: ${var.schedule_status}
       tags:
         foo: bar
         bar: baz

bundle/schema/embed_test.go

@@ -59,8 +59,8 @@ func TestJsonSchema(t *testing.T) {
 	}
 
 	providers := walk(s.Definitions, "github.com", "databricks", "databricks-sdk-go", "service", "jobs.GitProvider")
-	assert.Contains(t, providers.Enum, "gitHub")
-	assert.Contains(t, providers.Enum, "bitbucketCloud")
-	assert.Contains(t, providers.Enum, "gitHubEnterprise")
-	assert.Contains(t, providers.Enum, "bitbucketServer")
+	assert.Contains(t, providers.OneOf[0].Enum, "gitHub")
+	assert.Contains(t, providers.OneOf[0].Enum, "bitbucketCloud")
+	assert.Contains(t, providers.OneOf[0].Enum, "gitHubEnterprise")
+	assert.Contains(t, providers.OneOf[0].Enum, "bitbucketServer")
 }