docker: use itzaname docker proxy to avoid getting rate-limited

Containerfile

@@ -1,5 +1,5 @@
 # Stage 1: Build
-FROM docker.io/golang:1.23 AS builder
+FROM registry.itzana.me/docker-proxy/golang:1.24 AS builder
 
 # Set the working directory in the container
 WORKDIR /app
@@ -14,7 +14,7 @@ COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -o service ./cmd/maps-service/service.go
 
 # Stage 2: Run
-FROM alpine
+FROM registry.itzana.me/docker-proxy/alpine:3.21
 
 # Set up a non-root user for security
 RUN addgroup -S appgroup && adduser -S appuser -G appgroup