add keycloak 2 and 3

compose.keycloak2.yml

@@ -0,0 +1,17 @@
+---
+version: "3.8"
+
+services:
+  app:
+    secrets:
+      - keycloak2_client_secret
+    environment:
+      - KEYCLOAK2_CLIENT_ID
+      - KEYCLOAK2_ENABLED
+      - KEYCLOAK2_NAME
+      - KEYCLOAK2_URL
+
+secrets:
+  keycloak2_client_secret:
+    external: true
+    name: ${STACK_NAME}_keycloak2_client_secret_${SECRET_KEYCLOAK2_CLIENT_SECRET_VERSION}