fix: pin elixir alpine image

Dockerfile

@@ -1,4 +1,4 @@
-FROM elixir:alpine AS build
+FROM elixir:24-alpine AS build
 
 # install build dependencies
 RUN apk add --no-cache build-base npm git curl py-pip rust cargo
@@ -51,4 +51,4 @@ RUN chmod +x /app/startup.sh
 
 ENV HOME=/app
 
-CMD ["/app/startup.sh"]
+CMD ["/app/startup.sh"]