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scripts/docker-prune.sh

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+#!/usr/bin/env bash
+# Free disk before docker compose build (build cache is the usual culprit for Go OOM / no space).
+# Safe on deploy hosts: does NOT use --volumes (keeps named DB volumes).
+set -euo pipefail
+
+docker_cmd() {
+  if docker info >/dev/null 2>&1; then
+    docker "$@"
+  elif sudo docker info >/dev/null 2>&1; then
+    sudo docker "$@"
+  else
+    echo "docker not available — skip prune" >&2
+    return 1
+  fi
+}
+
+echo "==> disk before prune"
+df -h / 2>/dev/null || true
+if [[ -d /var/lib/docker ]]; then
+  df -h /var/lib/docker 2>/dev/null || true
+fi
+
+if ! docker info >/dev/null 2>&1 && ! sudo docker info >/dev/null 2>&1; then
+  echo "docker not available — skip prune" >&2
+  exit 0
+fi
+
+echo "==> docker builder prune (build cache)"
+docker_cmd builder prune -af || true
+
+echo "==> docker system prune (unused images, stopped containers, networks)"
+docker_cmd system prune -af || true
+
+echo "==> disk after prune"
+df -h / 2>/dev/null || true
+if [[ -d /var/lib/docker ]]; then
+  df -h /var/lib/docker 2>/dev/null || true
+fi