docker: added libervia e2e image and include it in docker-compose_e2e:

The `libervia_e2e` image is based on main `libervia` one, and add, register and set the
same test certificates as the ones used in `backend_e2e`.

docker/docker-compose_e2e.yml

@@ -46,3 +46,14 @@ services:
       default:
         aliases:
           - sat.test
+
+  libervia:
+    image: salutatoi/libervia_e2e
+    build: libervia_e2e
+    depends_on:
+      - sat
+    environment:
+      LIBERVIA_PASSPHRASE: test_e2e
+    ports:
+        - "8080"
+        - "8443"