fix: add C NIF compilation to k8s Dockerfile

Match the root Dockerfile changes:
- Add libsnmp-dev build dependency
- Add libsnmp40 runtime dependency
- Copy c_src and compile C NIF before Elixir compilation
- Add TERM=dumb for cross-architecture builds

k8s/Dockerfile

@@ -22,11 +22,13 @@ ARG RUNNER_IMAGE="docker.io/debian:${DEBIAN_VERSION}"
 
 FROM ${BUILDER_IMAGE} AS builder
 ENV MIX_OS_DEPS_COMPILE_PARTITION_COUNT=6
+# Disable TTY for cross-architecture builds
+ENV TERM=dumb
 
 # install build dependencies
 RUN apt-get update \
     && DEBIAN_FRONTEND=noninteractive apt-get upgrade -y \
-    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends build-essential git \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends build-essential git libsnmp-dev \
     && rm -rf /var/lib/apt/lists/*
 
 # prepare build dir
@@ -61,6 +63,11 @@ RUN --mount=type=cache,target=/root/.mix \
 
 COPY priv priv
 
+COPY c_src c_src
+
+# Compile the C NIF before Elixir compilation
+RUN cd c_src && make
+
 COPY lib lib
 
 # Compile the release
@@ -83,7 +90,7 @@ FROM ${RUNNER_IMAGE} AS final
 
 RUN apt-get update \
     && DEBIAN_FRONTEND=noninteractive apt-get upgrade -y \
-    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends libstdc++6 openssl libncurses6 locales ca-certificates iputils-ping snmp \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends libstdc++6 openssl libncurses6 locales ca-certificates iputils-ping snmp libsnmp40 \
     && rm -rf /var/lib/apt/lists/*
 
 # Set the locale