Prerequisites for reusing `.pattern_tests_template` in Hived and HAF-apps CI

templates/test_jobs.gitlab-ci.yml

@@ -56,7 +56,10 @@ variables:
     PATTERN_TESTS_DIR: ""  # To be overrided in derived job
     DIRECT_CALLS: 0        # To be overrided in derived job
 
+    TOX_VERSION: "3.25.1"
+
   script:
+    - pip3 install tox==${TOX_VERSION} # maybe it should be added to some poetry config ?
     # run pattern tests
     - cd "${PATTERN_TESTS_DIR}"
     - ./run_tests.sh ${TESTED_ENDPOINT} `git rev-parse --show-toplevel` "${TEST_SUITE}" ${DIRECT_CALLS}