Add pytest-tags in requirements.txt

Signed-off-by: Ncai.zhang <cai.zhang@zilliz.com>

build/docker/test/Dockerfile

@@ -13,6 +13,6 @@ FROM python:3.6.8-jessie
 
 COPY ./tests/python_test/requirements.txt /requirements.txt
 
-RUN python3 -m pip install -r /requirements.txt && python3 -m pip install git+https://gitee.com/quicksilver/pytest-tags.git
+RUN python3 -m pip install --no-cache-dir -r /requirements.txt
 
 CMD ["tail", "-f", "/dev/null"]

tests/python/requirements.txt

@@ -11,3 +11,4 @@ allure-pytest==2.7.0
 pytest-print==0.1.2
 pytest-level==0.1.1
 pytest-xdist==1.23.2
+git+https://gitee.com/quicksilver/pytest-tags.git

tests/python_test/requirements.txt

@@ -11,3 +11,4 @@ allure-pytest==2.7.0
 pytest-print==0.1.2
 pytest-level==0.1.1
 pytest-xdist==1.23.2
+git+https://gitee.com/quicksilver/pytest-tags.git