build(container): fix Caddy stage permissions by using COPY --chown and drop chown RUN to avoid rootfs perms error

Dockerfile

@@ -59,7 +59,7 @@ FROM caddy:2-alpine AS production
 RUN apk add --no-cache curl
 
 # Copy built files from builder stage
-COPY --from=builder /app/dist /usr/share/caddy
+COPY --from=builder --chown=caddy:caddy /app/dist /usr/share/caddy
 
 # Configure Caddy to serve SPA with health endpoint (no TLS)
 RUN cat > /etc/caddy/Caddyfile <<'CADDY'
@@ -78,8 +78,7 @@ RUN cat > /etc/caddy/Caddyfile <<'CADDY'
 }
 CADDY
 
-# Set proper permissions for caddy
-RUN chown -R caddy:caddy /usr/share/caddy /etc/caddy
+# Permissions: using default ownership; no chown required
 
 # Switch to caddy user
 USER caddy