Upgrade base OS to Alpine 3.19, minor ElastiCache fix

Dockerfile

@@ -2,11 +2,15 @@
 # libexec is missing from >=3.17
 
 # Stage 1 - bundle base image + runtime
-FROM python:3.11-alpine3.16 AS python-alpine
+FROM python:3.12-alpine3.19 AS python-alpine
+ARG  ALPINE="v3.19"
 
 # Install GCC (Alpine uses musl but we compile and link dependencies with GCC)
-RUN apk upgrade -U --available --no-cache && \
-    apk add --no-cache \
+RUN echo "@kubezero https://cdn.zero-downtime.net/alpine/${ALPINE}/kubezero" >> /etc/apk/repositories && \
+    wget -q -O /etc/apk/keys/stefan@zero-downtime.net-61bb6bfb.rsa.pub https://cdn.zero-downtime.net/alpine/stefan@zero-downtime.net-61bb6bfb.rsa.pub
+
+RUN apk -U --no-cache upgrade && \
+    apk --no-cache add \
     libstdc++
 
 
@@ -15,8 +19,7 @@ FROM python-alpine AS build-image
 ARG TAG="latest"
 
 # Install aws-lambda-cpp build dependencies
-RUN apk upgrade -U --available --no-cache && \
-    apk add --no-cache \
+RUN apk --no-cache add \
     build-base \
     libtool \
     autoconf \
@@ -25,8 +28,8 @@ RUN apk upgrade -U --available --no-cache && \
     cmake \
     libcurl \
     libffi-dev \
-    libexecinfo-dev \
-    openssl-dev
+    openssl-dev \
+    libexecinfo-dev@kubezero
     # cargo
 
 # Install requirements

app.py

@@ -261,6 +261,11 @@ def handler(event, context):
         title = "ElastiCache fail over complete"
         body = "for node {}".format(msg["ElastiCache:FailoverComplete"])
 
+    # ElasticCache update notifications
+    elif "ElastiCache:ServiceUpdateAvailableForNode" in msg:
+        title = "ElastiCache update available"
+        body = "for node {}".format(msg["ElastiCache:ServiceUpdateAvailableForNode"])
+
     # known RDS events
     elif "Event Source" in msg and msg['Event Source'] in ["db-instance", "db-cluster-snapshot", "db-snapshot"]:
         try: