Fix: add build-essential for Python C extension packages (#13772)

### What problem does this PR solve?

The removal of cargo in commit f59d96f87 also removed build-essential
which was needed to compile C extension packages like datrie.

Use aliyun mirror for coverage pip install

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

.github/workflows/tests.yml

@@ -220,7 +220,7 @@ jobs:
           echo "HOST_ADDRESS=http://host.docker.internal:${SVR_HTTP_PORT}" >> ${GITHUB_ENV}
 
           # Patch entrypoint.sh for coverage
-          sed -i '/"\$PY" api\/ragflow_server.py \${INIT_SUPERUSER_ARGS} &/c\   echo "Ensuring coverage is installed..."\n      "$PY" -m pip install coverage\n     export COVERAGE_FILE=/ragflow/logs/.coverage\n        echo "Starting ragflow_server with coverage..."\n        "$PY" -m coverage run --source=./api/apps --omit="*/tests/*,*/migrations/*" -a api/ragflow_server.py ${INIT_SUPERUSER_ARGS} &' ./entrypoint.sh
+          sed -i '/"\$PY" api\/ragflow_server.py \${INIT_SUPERUSER_ARGS} &/c\   echo "Ensuring coverage is installed..."\n      "$PY" -m pip install coverage -i https://mirrors.aliyun.com/pypi/simple\n     export COVERAGE_FILE=/ragflow/logs/.coverage\n        echo "Starting ragflow_server with coverage..."\n        "$PY" -m coverage run --source=./api/apps --omit="*/tests/*,*/migrations/*" -a api/ragflow_server.py ${INIT_SUPERUSER_ARGS} &' ./entrypoint.sh
 
           sudo docker compose -f docker-compose.yml -p ${GITHUB_RUN_ID} up -d
           cd ..

Dockerfile

@@ -42,6 +42,7 @@ RUN --mount=type=cache,id=ragflow_apt,target=/var/cache/apt,sharing=locked \
     echo 'Binary::apt::APT::Keep-Downloaded-Packages "true";' > /etc/apt/apt.conf.d/keep-cache && \
     chmod 1777 /tmp && \
     apt update && \
+    apt install -y build-essential && \
     apt install -y libglib2.0-0 libglx-mesa0 libgl1 && \
     apt install -y pkg-config libicu-dev libgdiplus && \
     apt install -y default-jdk && \