Render templates using env before dereferencing

Allows using `${{ env.anything }}` in `$ref`s.

See stepci/stepci#220 for a use case explanation.

Author: RemiBardon

src/index.ts

@@ -202,8 +202,10 @@ function renderObject<T extends object>(
 
 // Run from test file
 export async function runFromYAML(yamlString: string, options?: WorkflowOptions): Promise<WorkflowResult> {
-  const workflow = yaml.load(yamlString)
-  const dereffed = await $RefParser.dereference(workflow as any, {
+  const workflow = yaml.load(yamlString) as any
+  const env = { ...workflow.env, ...options?.env }
+  renderObject(workflow, { env })
+  const dereffed = await $RefParser.dereference(workflow, {
     dereference: {
       circular: 'ignore'
     }