LCORE-1872: Fix llama-stack container startup issues

Fixes two issues preventing llama-stack container from starting:

1.SQLite compatibility error - Switch base image from ubi9/ubi-minimal to ubi9/python-312.
The minimal image ships with SQLite < 3.30.0 which lacks sqlite3_deserialize support required
by Python 3.12's _sqlite3 module. The python-312 base image includes a compatible SQLite version
and properly configured Python dependencies.

2.Read-only filesystem error - Config enrichment script now writes to /tmp/enriched-run.yaml
instead of /opt/app-root/run.yaml. The latter is mounted read-only from the host, causing OSError
when the enrichment script attempts to write the enriched configuration.

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

Author: anik120

deploy/llama-stack/test.containerfile

@@ -1,11 +1,12 @@
-# Upstream llama-stack built from Red Hat UBI
-FROM registry.access.redhat.com/ubi9/ubi-minimal
+# Upstream llama-stack built from Red Hat UBI Python 3.12 image
+FROM registry.access.redhat.com/ubi9/python-312
 
 USER root
 
-# Install Python and build tools
-RUN microdnf install -y --nodocs --setopt=keepcache=0 --setopt=tsflags=nodocs \
-    python3.12 python3.12-devel python3.12-pip git tar gcc gcc-c++ make
+# Install additional build tools
+RUN dnf install -y --nodocs --setopt=keepcache=0 --setopt=tsflags=nodocs \
+    git tar gcc gcc-c++ make && \
+    dnf clean all
 
 # Install uv
 ENV PATH="/root/.local/bin:${PATH}"

scripts/llama-stack-entrypoint.sh

@@ -5,7 +5,7 @@
 set -e
 
 INPUT_CONFIG="${LLAMA_STACK_CONFIG:-/opt/app-root/run.yaml}"
-ENRICHED_CONFIG="/opt/app-root/run.yaml"
+ENRICHED_CONFIG="/tmp/enriched-run.yaml"
 LIGHTSPEED_CONFIG="${LIGHTSPEED_CONFIG:-/opt/app-root/lightspeed-stack.yaml}"
 
 # Enrich config if lightspeed config exists