test: add resumable isolated test harness

scripts/test-env

@@ -1,20 +1,17 @@
 #!/bin/sh
 set -eu
 
+repo_root=$(CDPATH= cd -- "$(dirname -- "$0")/.." && pwd)
 command=${1:-}
-case "$command" in
-  doctor)
-    docker version >/dev/null
-    docker compose version >/dev/null
-    echo "Docker and Docker Compose are available."
-    ;;
-  status)
-    echo "No test run has been created; the shared harness is not implemented yet."
-    ;;
-  *)
-    echo "usage: scripts/test-env doctor|status" >&2
-    echo "recover/reuse/collect/reset/purge arrive with the Phase 0 harness implementation" >&2
-    exit 2
-    ;;
-esac
+if [ -z "$command" ]; then
+  echo "usage: scripts/test-env doctor|coverage|status|logs|collect|recover|reuse|stop|reset|purge [--run-id ID]" >&2
+  exit 2
+fi
+shift
 
+docker version >/dev/null
+docker compose version >/dev/null
+
+cd "$repo_root"
+exec docker compose -f deploy/compose.yaml run --rm toolchain \
+  go run ./test/harness "$command" "$@"