Update TMPDIR and PIP_CACHE_DIR environment variables

Author: jagapiou

.github/actions/install/action.yml

@@ -62,10 +62,9 @@ runs:
         echo "TMPDIR=${TMPDIR}"
         echo "PIP_CACHE_DIR=${PIP_CACHE_DIR}"
         echo "env.TMPDIR=${{env.TMPDIR}}" 
-        # export TMPDIR="/home/${USER}/tmp"
-        # mkdir -p "${TMPDIR}"
-        export TMPDIR="${RUNNER_TEMP}"
-        export PIP_CACHE_DIR="${RUNNER_TEMP}"
+        export TMPDIR="/home/${USER}/tmp"
+        mkdir -p "${TMPDIR}"
+        export PIP_CACHE_DIR="${TMPDIR}"
         ./bin/install.sh
 
     - name: Show installation