refactor: slim down the backend containers (#4233)

* refactor: slim down the backend containers

* refactor: make containers run as non-root user in container

* chore: correct casing for the build stage definitions

* chore: remove docker compose version field as its obsolete

* chore: optimise chown and chmod into the COPY command itself

* chore: add package overrides for packages with reported vulns

* chore: add pnpm to containers + set workdir dir to the backend project

* fix: permission issues with the fe containers

* chore: define env variables on AIO

packages/hoppscotch-selfhost-web/selfhost-web.Caddyfile

@@ -1,5 +1,5 @@
 :80 :3000 {
 	try_files {path} /
-	root * /site
+	root * /site/selfhost-web
 	file_server
 }