Switch variable name to avoid conflict with conda setup

gitlab/functions.sh

@@ -202,8 +202,8 @@ if [ -z "${CONDA_FOLDER}" ]; then
   CONDA_FOLDER=/opt/conda
 fi
 
-if [ -z "${CONDA_PREFIX}" ]; then
-  CONDA_PREFIX=env
+if [ -z "${VIRTUALENV_PATH}" ]; then
+  VIRTUALENV_PATH=env
 fi
 
 if [ -z "${DOCSERVER}" ]; then
@@ -211,7 +211,7 @@ if [ -z "${DOCSERVER}" ]; then
   export_env DOCSERVER
 fi
 
-PREFIX=${CI_PROJECT_DIR}/${CONDA_PREFIX}
+PREFIX=${CI_PROJECT_DIR}/${VIRTUALENV_PATH}
 
 if [ "${ARCH}" == "linux" ]; then
   # Temporary hack to get building done right with gcc-5 compilers
@@ -252,7 +252,7 @@ check_env DOCSERVER
 check_env PYPISERVER
 check_env TESTSERVER
 check_env CONDA_FOLDER
-check_env CONDA_PREFIX
+check_env VIRTUALENV_PATH
 export_env LD_LIBRARY_PATH
 export_env BOB_PREFIX_PATH