fix(python): pin exllama2 (#1711)

fix(python): pin python deps

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

backend/python/diffusers/install.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -ex
+
+# Check if environment exist
+conda_env_exists(){
+    ! conda list --name "${@}" >/dev/null 2>/dev/null
+}
+
+if conda_env_exists "diffusers" ; then
+    echo "Creating virtual environment..."
+    conda env create --name diffusers --file $1
+    echo "Virtual environment created."
+else 
+    echo "Virtual environment already exists."
+fi
+
+if [ "$PIP_CACHE_PURGE" = true ] ; then
+    export PATH=$PATH:/opt/conda/bin
+
+    # Activate conda environment
+    source activate diffusers
+
+    pip cache purge
+fi