Insert variable into conf file instead of environment

Author: martin-s-a

.github/workflows/build.yml

@@ -61,7 +61,6 @@ jobs:
       - name: Compile Xmipp will all dependencies in branch ${{ github.head_ref }} (if such branch exists, default is devel)
         env:
           BRANCH_NAME: ${{ github.head_ref }}
-          SEND_INSTALLATION_STATISTICS: OFF 
         run: |
-          echo "XMIPP_LINK_TO_SCIPION=OFF" > xmipp.conf
+          echo "XMIPP_LINK_TO_SCIPION=OFF\nSEND_INSTALLATION_STATISTICS=OFF" > xmipp.conf
           ./xmipp all -b $BRANCH_NAME --keep-output || (cat compilation.log && false)