Don't interpolate joboutputs, before job is done (#894)

* Don't interpolate joboutputs, before job is donei

All credits go to @ChristopherHX which fixed this issue.
I only created a PR for this so it will be fixed in the upstream binary.

This fixes #758

* Added output test

* Fix typo

pkg/runner/runner_test.go

@@ -120,6 +120,7 @@ func TestRunEvent(t *testing.T) {
 		{"testdata", "issue-597", "push", "", platforms, ""},
 		{"testdata", "issue-598", "push", "", platforms, ""},
 		{"testdata", "env-and-path", "push", "", platforms, ""},
+		{"testdata", "outputs", "push", "", platforms, ""},
 		{"../model/testdata", "strategy", "push", "", platforms, ""}, // TODO: move all testdata into pkg so we can validate it with planner and runner
 		// {"testdata", "issue-228", "push", "", platforms, ""}, // TODO [igni]: Remove this once everything passes