re-adding writable-tmpfs

.gitlab-ci.yml

@@ -37,7 +37,7 @@ variables:
     - stack
   variables:
     COMMAND_OPTIONS_SBATCH: ${slurm_options}
-    APPTAINER_EXEC_OPTIONS: ${apptainer_options} --bind ${BUILDCACHE}:/buildcache:rw --bind ${SPACK_PATH}:/spack:rw --bind ${STACK_PATH}:/stack:rw
+    APPTAINER_EXEC_OPTIONS: ${apptainer_options} --bind ${BUILDCACHE}:/buildcache:rw --bind ${SPACK_PATH}:/spack:rw --bind ${STACK_PATH}:/stack:rw --writable-tmpfs
 
 # ------------------------------------------------------------------------------
 spack:setup: