feat: support ignoring an existing version of the binary

As we move wallet-platform to self-hosted runners for tests we have
a new error case where binaries from previous runs may exist on the
runner. We need to allow the user to opt-in to ignoring such cases.

This is non-breaking as existing behaviour is preserved.

Ticket: DO-14423

Author: therealdwright

action.yml

@@ -16,6 +16,9 @@ inputs:
   cache:
     description: Runtime switch to enable/disable caching because GitHub is debugging issues in their caching API
     default: false
+  ignore-existing-binary:
+    description: Skip download if the binary already exists at the destination
+    default: false
 
 runs:
   using: node20