Add SSO support.

.env.sample

@@ -7,6 +7,12 @@ DOMAIN=voila.example.com
 
 LETS_ENCRYPT_ENV=production
 
+COMPOSE_FILE="compose.yml"
+
+# Single Sign-On using traefik-forward-auth
+#TFA_MIDDLEWARE_NAME="keycloak"
+#COMPOSE_FILE="$COMPOSE_FILE:compose.sso.yml"
+
 # The voila version to pin to (can be overriden by requirements.txt)
 VOILA_VERSION=0.4.0
 # The directory to run voila from.

compose.sso.yml

@@ -0,0 +1,8 @@
+version: "3.8"
+services:
+  app:
+    environment:
+      - TFA_MIDDLEWARE_NAME
+    deploy:
+      labels:
+        - "traefik.http.routers.${STACK_NAME}.middlewares=${TFA_MIDDLEWARE_NAME}@file"