fix(docker): error: failed to write to file /app/uv.lock`

Also improve Dockerfile setup

Dockerfile

@@ -7,14 +7,16 @@ RUN useradd -u 1000 -d ${WORKDIR} -M app
 RUN chown -R app:app ${WORKDIR}
 USER 1000
 
+# Cache-friendly dependency installation
+COPY pyproject.toml uv.lock ./
 # https://docs.astral.sh/uv/guides/integration/docker/#installing-uv
-COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /bin/
+RUN uv sync --locked --no-dev
 
-# This just works... splitting this up for better caching is a pain with Python.
-COPY . .
-RUN uv sync --frozen
+COPY ancv/ ancv/
 
+# Required for Google Cloud Run to auto-detect
 EXPOSE 8080
 
-ENTRYPOINT [ "uv", "run", "ancv" ]
+ENTRYPOINT [ "uv", "run", "--locked", "--module", "ancv" ]
 CMD [ "serve", "api", "--port", "8080" ]