optimization: use slim python image variant

- hiredis compilation fixed

Dockerfile

@@ -3,7 +3,7 @@
 ############
 
 ARG NODE_VERSION=lts
-ARG PYTHON_VERSION=3.12
+ARG PYTHON_VERSION=3.12-slim
 FROM node:${NODE_VERSION} AS build-ui
 
 # env setup
@@ -57,6 +57,9 @@ RUN set -ex; \
   export DEBIAN_FRONTEND=noninteractive; \
   apt-get update; apt-get install --yes --no-install-recommends \
     libmagic1 \
+    # need to build hiredis
+    gcc \
+    libc-dev \
   ; rm -rf /var/lib/apt/lists/*; \
   \
   # install ovdashboard_api