fix binary path

.github/actions/dockerfiles/Dockerfile.debian

@@ -35,7 +35,7 @@ ENTRYPOINT ["/bin/sh", "-c", "/usr/local/bin/emily-server --host $HOST --port $P
 
 # Create Docker image to run the signer.
 FROM debian:bookworm-slim AS signer
-COPY --from=build /code/sbtc/target/debug/sbtc-signer /usr/local/bin/sbtc-signer
+COPY --from=build /code/sbtc/target/debug/signer /usr/local/bin/signer
 ENTRYPOINT ["/usr/local/bin/signer --config /signer-config.toml --migrate-db"]
 
 # Create Docker image to run the blocklist client.