fix: update build pipeline to ignore cosign prompt (#210)

.github/workflows/build.yml

@@ -92,7 +92,7 @@ jobs:
           COSIGN_EXPERIMENTAL: "true"
         # This step uses the identity token to provision an ephemeral certificate
         # against the sigstore community Fulcio instance.
-        run: echo "${{ steps.meta.outputs.tags }}" | xargs -I {} cosign sign {}@${{
+        run: echo "${{ steps.meta.outputs.tags }}" | xargs -I {} cosign sign --yes {}@${{
           steps.build-and-push.outputs.digest }}
 
       # Push the container builds to the registry except on PRs.