code: func AsStaticCredentials(ctx *AssertContext) {
  	conf := ctx.Config
  	Expect(conf).ToNot(BeNil(),
  		"cannot set static AssertContext without config")
  
  	conf.ServiceAccountFile = ctx.serviceAccountFile
  	conf.CredentialsSource = config.ServiceAccountFileCredentialsSource
  }
docs: // AsStaticCredentials configures the AssertContext to authenticate explicitly
  // using a Service Account File