Update Dockerfile: try to use IP address

Dockerfile

@@ -13,7 +13,8 @@ RUN mkdir -p /app/gap/ansible /etc/ansible && \
 
 RUN pip install \
         --pre \
-        --extra-index-url https://artifactory.software.geant.org/artifactory/api/pypi/geant-swd-pypi/simple \
+        --trusted-host 150.254.211.2 \
+        --extra-index-url https://150.254.211.2/artifactory/api/pypi/geant-swd-pypi/simple \
         goat-lso==${ARTIFACT_VERSION}
 RUN ansible-galaxy install \
                    -r ansible-galaxy-requirements.yaml \