Add workflow dispatch to action

Signed-off-by: Ry Jones <ry@linux.com>

.github/workflows/release-test.yml

@@ -7,6 +7,7 @@ name: Release tests
 # If the tracker branch does not exist, the downstream pipeline should detect it and run on the main branch instead.
 on:
   push:
+  workflow_dispatch:
   release:
     types: [published]