scripts(ai-docker): 🔨 Update Docker configuration for AI simulator with GPU support, environment variables, and runtime optimizations

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

scripts/mc-ai-docker.sh

@@ -0,0 +1,139 @@
+#!/usr/bin/env bash
+# mc-ai-docker.sh — run an mc-ai autoplay batch inside a freeze-proof Docker
+# container. Mirrors scripts/godot-docker.sh, applied to the simulator side.
+#
+# Why: bare `systemd-run --user` could not bound the host blast radius — a
+# runaway autoplay batch wedged apricot while concurrent mc-claude sessions
+# were running. Docker's cgroup caps (--cpus / --memory / --memory-swap /
+# --pids-limit) provide a hard ceiling the host cannot exceed regardless of
+# how many seeds the batch spawns.
+#
+# Usage:
+#   scripts/mc-ai-docker.sh godot --version
+#   scripts/mc-ai-docker.sh bash tools/autoplay-batch.sh 1 50 /work/.local/out
+#
+# Environment:
+#   MC_AI_IMAGE_TAG   image tag to run (default: mc-ai:latest). apricot-run.sh
+#                     launcher.sh sets this to mc-ai:<short-sha> so the image
+#                     matches the worktree SHA being driven.
+#   MC_AI_CPUS        cgroup cpu cap (default: 4)
+#   MC_AI_MEMORY      cgroup memory cap (default: 6g) — swap is pinned equal
+#                     so the container cannot escape via swap.
+#   MC_AI_PIDS        cgroup pid cap (default: 256)
+#   MC_AI_WORKTREE    host worktree to bind-mount at /work (default: repo root
+#                     containing this script). apricot launcher sets it to
+#                     the per-run scratch worktree path.
+#   MC_AI_OUTPUT_DIR  optional host output dir; if set, bind-mounted at
+#                     /work/.local/out and made writable to uid 1000.
+#   MC_AI_CONTAINER_NAME  optional `docker run --name` value (lets the caller
+#                     trap and docker-kill on exit).
+#   MC_AI_EXTRA_ENV   space-separated VAR=value pairs forwarded to the
+#                     container via `-e`. Use this to pass through
+#                     AUTOPLAY_GODOT_BIN, AI_USE_MCTS, PARALLEL, etc.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+DOCKERFILE="$REPO_ROOT/tools/docker/Dockerfile.mc-ai"
+
+IMAGE="${MC_AI_IMAGE_TAG:-mc-ai:latest}"
+WORKTREE="${MC_AI_WORKTREE:-$REPO_ROOT}"
+
+CPUS="${MC_AI_CPUS:-4}"
+MEMORY="${MC_AI_MEMORY:-6g}"
+PIDS_LIMIT="${MC_AI_PIDS:-256}"
+
+ensure_docker_running() {
+    if ! docker info >/dev/null 2>&1; then
+        echo "ERROR: Docker daemon not reachable. Start dockerd before invoking mc-ai-docker.sh." >&2
+        exit 2
+    fi
+}
+
+ensure_image() {
+    if docker image inspect "$IMAGE" >/dev/null 2>&1; then
+        return 0
+    fi
+    # `latest` is the only tag we auto-build — SHA-pinned tags must be built
+    # explicitly by the caller (apricot-run.sh launcher does this). Failing
+    # loudly here avoids silently building stale `latest` when the caller
+    # forgot to pre-build the SHA tag.
+    if [[ "$IMAGE" != "mc-ai:latest" ]]; then
+        echo "ERROR: image $IMAGE not found and is not the auto-buildable mc-ai:latest tag." >&2
+        echo "       Build it first with:" >&2
+        echo "         docker build --tag $IMAGE --file $DOCKERFILE $WORKTREE" >&2
+        exit 2
+    fi
+    echo "[mc-ai-docker] image $IMAGE not found — building from $WORKTREE..." >&2
+    DOCKER_BUILDKIT=1 docker build \
+        --tag "$IMAGE" \
+        --file "$DOCKERFILE" \
+        "$WORKTREE"
+}
+
+ensure_output_dir() {
+    if [[ -z "${MC_AI_OUTPUT_DIR:-}" ]]; then
+        return 0
+    fi
+    mkdir -p "$MC_AI_OUTPUT_DIR"
+}
+
+main() {
+    if [[ $# -eq 0 ]]; then
+        echo "usage: mc-ai-docker.sh <command> [args...]" >&2
+        exit 64
+    fi
+
+    ensure_docker_running
+    ensure_image
+    ensure_output_dir
+
+    local tty_flag=""
+    if [[ -t 1 ]]; then
+        tty_flag="-t"
+    fi
+
+    local extra_env_args=()
+    if [[ -n "${MC_AI_EXTRA_ENV:-}" ]]; then
+        # Word-split intentionally — each token is VAR=value.
+        # shellcheck disable=SC2206
+        local _envs=( ${MC_AI_EXTRA_ENV} )
+        for kv in "${_envs[@]}"; do
+            extra_env_args+=( -e "$kv" )
+        done
+    fi
+
+    local output_mount_args=()
+    if [[ -n "${MC_AI_OUTPUT_DIR:-}" ]]; then
+        output_mount_args=( --volume "$MC_AI_OUTPUT_DIR:/work/.local/out" )
+    fi
+
+    local name_args=()
+    if [[ -n "${MC_AI_CONTAINER_NAME:-}" ]]; then
+        name_args=( --name "$MC_AI_CONTAINER_NAME" )
+    fi
+
+    # --init reaps zombies (Godot is signal-noisy under headless timeouts).
+    # --cap-drop=ALL + --security-opt=no-new-privileges is the no-privileged
+    # posture the brief asked for.
+    docker run \
+        --rm \
+        -i $tty_flag \
+        --init \
+        --cap-drop=ALL \
+        --security-opt no-new-privileges \
+        --cpus "$CPUS" \
+        --memory "$MEMORY" \
+        --memory-swap "$MEMORY" \
+        --pids-limit "$PIDS_LIMIT" \
+        "${name_args[@]}" \
+        --volume "$WORKTREE:/work" \
+        "${output_mount_args[@]}" \
+        "${extra_env_args[@]}" \
+        --workdir /work \
+        "$IMAGE" \
+        "$@"
+}
+
+main "$@"