CI: Add Makefile to /frontend directory

Signed-off-by: Michael Mayer <michael@photoprism.app>

frontend/Makefile

@@ -0,0 +1,41 @@
+# Copyright © 2018 - 2023 PhotoPrism UG. All rights reserved.
+#
+# Questions? Email us at hello@photoprism.app or visit our website to learn
+# more about our team, products and services: https://www.photoprism.app/
+
+# Declare "make" targets.
+all: install build
+dep: install-npm install-testcafe install
+dep-list:
+	npx npm-check-updates
+install-npm:
+	sudo npm install --unsafe-perm=true --allow-root -g npm@latest npm-check-updates@latest
+install-testcafe:
+	sudo npm install --unsafe-perm=true --allow-root -g testcafe@3.4.0
+install:
+	npm install --no-update-notifier --no-audit
+update:
+	npm update
+watch:
+	npm run watch
+build:
+	npm run build
+lint:
+	npm run lint
+fmt:
+	npm run fmt
+test:
+	npm run test
+upgrade:
+	npm run upgrade
+testcafe:
+	npm run testcafe
+acceptance-local:
+	npm run acceptance-local
+gettext-extract:
+	npm run gettext-extract
+gettext-compile:
+	npm run gettext-compile
+
+# Declare all targets as "PHONY", see https://www.gnu.org/software/make/manual/html_node/Phony-Targets.html.
+MAKEFLAGS += --always-make