build: generate a phar version of build-configs

run

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+set -eu
+
+TTY="${TTY:-}"
+if [[ ! -t 1 ]]; then
+  TTY="-T"
+fi
+
+export PATH=$PATH:./bin:./vendor/bin:./vendor-bin/box/vendor/bin
+
+# Delete any temporary or generated files.
+function clean {
+  rm -frv build build-configs tmp vendor vendor-bin/box/vendor
+}
+
+# Build the phar version of build-configs.
+function build {
+  clean
+
+  # Install dependencies.
+  composer validate
+  composer install --no-dev --prefer-dist --optimize-autoloader
+  composer install --prefer-dist --optimize-autoloader --working-dir ./vendor-bin/box
+
+  # Rebuild the Symfony cache.
+  build-configs cache:clear
+
+  # Generate the phar file.
+  box compile --config box.json.dist
+
+  # TODO: build a Nix derivation and add it to the store.
+}
+
+# Display a list of all available commands.
+function help {
+  printf "%s <task> [args]\n\nTasks:\n" "${0}"
+
+  compgen -A function | grep -v "^_" | cat -n
+
+  printf "\nExtended help:\n  Each task has comments for general usage\n"
+}
+
+TIMEFORMAT=$'\nTask completed in %3lR'
+time "${@:-help}"