feat: Apply overlay

Author: flemzord

.speakeasy/workflow.yaml

@@ -3,7 +3,9 @@ speakeasyVersion: latest
 sources:
     my-source:
         inputs:
-            - location: https://github.com/formancehq/stack/releases/download/v2.1.0-beta.3/generate.json
+            - location: https://github.com/formancehq/stack/releases/download/v2.1.0/generate.json
+        overlays:
+            - location: ./overlay.yaml
         registry:
             location: registry.speakeasyapi.dev/formance/formance/my-source
 targets: