add traefik redirection for matrix well-known files

.env.sample

@@ -70,6 +70,7 @@ AUTHENTIK_COLOR_BACKGROUND_LIGHT=#1c1e21
 
 # COMPOSE_FILE="$COMPOSE_FILE:compose.matrix.yml"
 # ELEMENT_DOMAIN=element-web.example.com
+# MATRIX_DOMAIN=matrix-synapse.example.com
 # SECRET_MATRIX_ID_VERSION=v1
 # SECRET_MATRIX_SECRET_VERSION=v1
 # APP_ICONS="$APP_ICONS matrix:~/.abra/recipes/authentik/icons/matrix.svg"

compose.matrix.yml

@@ -1,5 +1,11 @@
 version: "3.8"
 services:
+  app:
+    deploy:
+      labels:
+        - "traefik.http.routers.${STACK_NAME}.middlewares=redirect-matrix-well-known"
+        - "traefik.http.middlewares.redirect-matrix-well-known.redirectregex.regex=^https://(.*)/.well-known/matrix/(.*)"
+        - "traefik.http.middlewares.redirect-matrix-well-known.redirectregex.replacement=https://${MATRIX_DOMAIN}/.well-known/matrix/$$2"
   worker:
     secrets:
       - matrix_id