fix: remove assets directory from Dockerfile runtime stage

Author: nanotaboada

Dockerfile

@@ -39,7 +39,6 @@ COPY --from=builder     /app/target/*.jar           ./app.jar
 
 # Copy metadata docs for container registries (e.g.: GitHub Container Registry)
 COPY --chmod=444        README.md                   ./
-COPY --chmod=555        assets/                     ./assets/
 
 # Copy entrypoint and healthcheck scripts
 COPY --chmod=555        scripts/entrypoint.sh       ./entrypoint.sh