Merge project dependency copy in backend docker

Author: clay53

backend/Dockerfile

@@ -7,9 +7,7 @@ LABEL maintainer="Penn Labs"
 COPY --from=ghcr.io/astral-sh/uv@sha256:2381d6aa60c326b71fd40023f921a0a3b8f91b14d5db6b90402e65a635053709 /uv /uvx /bin/
 
 # Copy project dependencies
-COPY Pipfile* /app/
-COPY pyproject.toml /app/
-COPY uv.lock /app/
+COPY Pipfile* pyproject.toml uv.lock /app/
 
 # Install project dependencies using pipenv if pipenv enabled
 RUN if [ "$DEPENDENCY_MANAGER" = "pipenv" ]; then pipenv install --system; fi