force usage of venv python instead of system python in enrichment script

The enrichment script was failing with `ModuleNotFoundError: No module
named 'yaml'` because it was invoked with system Python instead of
virtualenv Python where dependencies are installed.

Signed-off-by: Anik Bhattacharjee <anbhatta@redhat.com>

Author: anik120

scripts/llama-stack-entrypoint.sh

@@ -12,7 +12,7 @@ LIGHTSPEED_CONFIG="${LIGHTSPEED_CONFIG:-/opt/app-root/lightspeed-stack.yaml}"
 if [ -f "$LIGHTSPEED_CONFIG" ]; then
     echo "Enriching llama-stack config..."
     ENRICHMENT_FAILED=0
-    python3 /opt/app-root/llama_stack_configuration.py \
+    /opt/app-root/.venv/bin/python3 /opt/app-root/llama_stack_configuration.py \
         -c "$LIGHTSPEED_CONFIG" \
         -i "$INPUT_CONFIG" \
         -o "$ENRICHED_CONFIG" 2>&1 || ENRICHMENT_FAILED=1

tests/e2e-prow/rhoai/manifests/lightspeed/llama-stack-openai.yaml

@@ -157,7 +157,7 @@ spec:
           if [[ -f "$LIGHTSPEED_CONFIG" ]]; then
             echo "Enriching llama-stack config..."
             ENRICHMENT_FAILED=0
-            python3 /opt/app-root/llama_stack_configuration.py \
+            /opt/app-root/.venv/bin/python3 /opt/app-root/llama_stack_configuration.py \
               -c "$LIGHTSPEED_CONFIG" \
               -i "$INPUT_CONFIG" \
               -o "$ENRICHED_CONFIG" 2>&1 || ENRICHMENT_FAILED=1

tests/e2e-prow/rhoai/manifests/lightspeed/llama-stack-prow.yaml

@@ -147,7 +147,7 @@ spec:
           if [[ -f "$LIGHTSPEED_CONFIG" ]]; then
             echo "Enriching llama-stack config..."
             ENRICHMENT_FAILED=0
-            python3 /opt/app-root/src/llama_stack_configuration.py \
+            /opt/app-root/.venv/bin/python3 /opt/app-root/src/llama_stack_configuration.py \
               -c "$LIGHTSPEED_CONFIG" \
               -i "$INPUT_CONFIG" \
               -o "$ENRICHED_CONFIG" 2>&1 || ENRICHMENT_FAILED=1