Optimize Docker (#575)

* reduce docker dev size

* reduce docker prod size

* fix lint

* add gunicorn

* fix bandit reported issues

* add docs external link icon

* add env vars to docs

* add permission to docker

* merge to one backend Dockerfile

* fix codefactor issues

* add docs for puid/pgid

* add docker healthcheck

pyproject.toml

@@ -34,7 +34,8 @@ Pillow = "^8.2.0"
 pathvalidate = "^2.4.1"
 apprise = "^0.9.2"
 recipe-scrapers = "^13.2.7"
-psycopg2 = { version = "^2.8.6", optional = true }
+psycopg2-binary = {version = "^2.9.1", optional = true}
+gunicorn = "^20.1.0"
 
 
 [tool.poetry.dev-dependencies]
@@ -67,4 +68,4 @@ testpaths = [
 skip_empty = true
 
 [tool.poetry.extras]
-pgsql = ["psycopg2"]
+pgsql = ["psycopg2-binary"]