scripts/run: mount recipe directory and publish port

- scripts/run now takes a recipe directory as its first argument,
  resolves it to an absolute path, and mounts it at /recipes in the
  Docker container
- Parses --port flag to map container port 8080 to the requested
  host port (default 8080)
- Passes --recipe-dir /recipes --port 8080 to the server
- Passes --host and any additional args through to the server
- Exits with an error if the recipe directory doesn't exist
- Also accept --host flag and pass remaining args through

Example: ./scripts/run ~/my-recipes --port 9090

scripts/run

@@ -1,4 +1,60 @@
 #!/usr/bin/env bash
+# Run the roux-server in Docker, mounting a local recipe directory.
+#
+# Usage: ./scripts/run <recipe-dir> [--host HOST] [--port PORT]
+#
+# The server listens on port 8080 inside the container, mapped to PORT
+# on the host (default 8080).  Pass --port to change the host-side port.
+#
+# Examples:
+#   ./scripts/run ~/recipes
+#   ./scripts/run ./cooklang-examples --port 9090
 set -euo pipefail
-cd "$(dirname "${BASH_SOURCE[0]}")/.."
-./hs stack exec roux-server -- "$@"
+
+PROJECT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+if [ $# -lt 1 ]; then
+    echo "Usage: $0 <recipe-dir> [--host HOST] [--port PORT]" >&2
+    exit 1
+fi
+
+# Resolve the recipe directory to an absolute path so Docker can mount it.
+RECIPE_DIR="$(cd "$1" && pwd)"
+shift
+
+# Parse --port from remaining args; everything else is passed to the server.
+HOST_PORT=8080
+SERVER_ARGS=()
+while [ $# -gt 0 ]; do
+    case "$1" in
+        --port)
+            HOST_PORT="$2"
+            shift 2
+            ;;
+        --host)
+            SERVER_ARGS+=("$1" "$2")
+            shift 2
+            ;;
+        *)
+            SERVER_ARGS+=("$1")
+            shift
+            ;;
+    esac
+done
+
+IMAGE="${HAWAT_HASKELL_TOOLS_IMAGE:-ghcr.io/flipstone/haskell-tools:debian-ghc-9.10.3-5d6640d}"
+STACK_ROOT_HOST="${PROJECT_DIR}/.stack-root"
+mkdir -p "${STACK_ROOT_HOST}"
+
+echo "[roux] mounting recipes from ${RECIPE_DIR}"
+echo "[roux] listening on http://127.0.0.1:${HOST_PORT}/"
+
+exec docker run --rm -i $([ -t 0 ] && printf -- -t) \
+    -v "${PROJECT_DIR}:/work" \
+    -v "${STACK_ROOT_HOST}:/stack-root" \
+    -v "${RECIPE_DIR}:/recipes" \
+    -e STACK_ROOT=/stack-root \
+    -w /work \
+    -p "${HOST_PORT}:8080" \
+    "${IMAGE}" \
+    stack exec roux-server -- --recipe-dir /recipes --port 8080 "${SERVER_ARGS[@]}"