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README.md

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+# Using Docker images
+
+Tabby Web consists of two Docker images - `backend` and `frontend`. See an example set up in `docker-compose.yml`
+
+## Environment variables
+
+### Frontend
+
+* `BACKEND_URL`
+* `WEB_CONCURRENCY`
+
+### Backend
+
+* `DATABASE_URL` (required).
+* `FRONTEND_URL`
+* `APP_DIST_STORAGE`: a `file://`, `s3://`, or `gcs://` URL to store app distros in.
+* `SOCIAL_AUTH_*_KEY` & `SOCIAL_AUTH_*_SECRET`: social login credentials, supported providers are `GITHUB`, `GITLAB`, `MICROSOFT_GRAPH` and `GOOGLE_OAUTH2`.
+* `ENABLE_HOMEPAGE`: set to `False` to disable the homepage and always redirect to the app.
+
+## Installing Tabby app versions
+
+* `docker-compose run backend ./manage.py add_version 1.0.156-nightly.1`