💡 Add comments to Dockerfile with uv references (#1357)

backend/Dockerfile

@@ -19,6 +19,7 @@ ENV UV_COMPILE_BYTECODE=1
 ENV UV_LINK_MODE=copy
 
 # Install dependencies
+# Ref: https://docs.astral.sh/uv/guides/integration/docker/#intermediate-layers
 RUN --mount=type=cache,target=/root/.cache/uv \
     --mount=type=bind,source=uv.lock,target=uv.lock \
     --mount=type=bind,source=pyproject.toml,target=pyproject.toml \
@@ -32,6 +33,8 @@ COPY ./pyproject.toml ./uv.lock ./alembic.ini /app/
 
 COPY ./app /app/app
 
+# Sync the project
+# Ref: https://docs.astral.sh/uv/guides/integration/docker/#intermediate-layers
 RUN --mount=type=cache,target=/root/.cache/uv \
     uv sync