create minio bucket automatically on startup (minio-initialize.sh)

Replace the one-shot minio-createbuckets service (which required a
manual 'abra app restart minio-createbuckets' that appeared to hang)
with a minio-initialize.sh config, ported from lasuite-docs. The minio
service entrypoint runs it in the background before starting minio; it
waits for minio to be ready and idempotently creates the
drive-media-storage bucket with versioning. Manual trigger:
'abra app cmd minio minio_initialize'.

compose.yml

@@ -228,28 +228,6 @@ services:
     networks:
       - backend
 
-  minio-createbuckets:
-    image: minio/minio:RELEASE.2025-09-07T16-13-09Z
-    environment: *minio-env
-    entrypoint: >
-      sh -c "
-      MINIO_ROOT_USER=\"\$$(cat /run/secrets/minio_ru)\" &&   
-      MINIO_ROOT_PASSWORD=\"\$$(cat /run/secrets/minio_rp)\" &&   
-      /usr/bin/mc alias set drive http://minio:9000 \$${MINIO_ROOT_USER} \"\$${MINIO_ROOT_PASSWORD}\" && \
-      /usr/bin/mc mb drive/drive-media-storage && \
-      /usr/bin/mc version enable drive/drive-media-storage && \
-      exit 0;"
-    deploy:
-      mode: replicated
-      replicas: 0
-      restart_policy:
-        condition: none
-    secrets:
-      - minio_rp
-      - minio_ru
-    networks:
-      - backend
-
   minio:
     image: minio/minio:RELEASE.2025-09-07T16-13-09Z
     environment: *minio-env
@@ -262,13 +240,17 @@ services:
       - backend
       - proxy
     command: minio server /data
-    entrypoint: ["/usr/bin/docker-entrypoint.sh"]
+    entrypoint: >
+      sh -c "/minio-initialize.sh & exec /usr/bin/docker-entrypoint.sh \"$$@\"" --
     volumes:
       - minio:/data
     configs:
       - source: abra_entrypoint
         target: /abra-entrypoint.sh
         mode: 0555
+      - source: minio_initialize
+        target: /minio-initialize.sh
+        mode: 0555
     secrets:
       - minio_rp
       - minio_ru
@@ -413,6 +395,9 @@ configs:
   migrate:
     name: ${STACK_NAME}_migrate_${MIGRATE_VERSION}
     file: migrate.sh
+  minio_initialize:
+    name: ${STACK_NAME}_minio_initialize_${MINIO_INITIALIZE_VERSION}
+    file: minio-initialize.sh
   onlyoffice_conf:
     name: ${STACK_NAME}_onlyoffice_conf_${ONLYOFFICE_CONF_VERSION}
     file: onlyoffice-config.json.tmpl