fixup! update docker image

compose.local-db.yml

@@ -15,7 +15,7 @@ services:
 
   db:
     restart: always
-    image: postgres:15-alpine
+    image: l1drm/postgres-pgroonga:alpine-15-znver4
     ports:
       - "5432:5432"
     env_file:

compose_example.yml

@@ -62,7 +62,7 @@ services:
 
   db:
     restart: always
-    image: l1drm/postgres-pgroonga:alpine-17-znver4
+    image: l1drm/postgres-pgroonga:alpine-15-znver4
     user: "${MISSKEY_UID}:${MISSKEY_GID}"
     networks:
       - internal_network