Remove legacy backup configuration

pre-hook doesn't get a shell context when run by abra, so use sh -c per 3wc

abra.sh

@@ -1,13 +1 @@
 export ENTRYPOINT_CONF_VERSION=v6
-
-abra_backup_app() {
-  _abra_backup_dir "app:/home/hackmd/app/public/uploads/"
-}
-
-abra_backup_db() {
-  _abra_backup_postgres "db" "codimd" "codimd" "db_password"
-}
-
-abra_backup() {
-  abra_backup_app && abra_backup_db
-}

compose.yml

@@ -33,7 +33,7 @@ services:
       - proxy
       - internal
     volumes:
-      - codimd_uploads:/home/hackmd/app/public/uploads
+      - codimd_uploads:/hedgedoc/public/uploads
     secrets:
       - db_password
     entrypoint: /docker-entrypoint.sh
@@ -43,7 +43,6 @@ services:
         mode: 0555
       - source: config_json
         target: /files/config.json
-        mode: 0555
     deploy:
       restart_policy:
         condition: on-failure
@@ -57,6 +56,8 @@ services:
         - "traefik.http.routers.${STACK_NAME}.middlewares=${STACK_NAME}-redirect"
         - "traefik.http.middlewares.${STACK_NAME}-redirect.headers.SSLForceHost=true"
         - "traefik.http.middlewares.${STACK_NAME}-redirect.headers.SSLHost=${DOMAIN}"
+        - "backupbot.backup=true"
+        - "backupbot.backup.path=/hedgedoc/public/uploads"
         - coop-cloud.${STACK_NAME}.version=0.5.0+1.9.6
     healthcheck:
       test: "nodejs -e \"http.get('http://localhost:3000', (res) => { console.log('status: ', res.statusCode); if (res.statusCode == 200) { process.exit(0); } else { process.exit(1); } });\""
@@ -78,10 +79,9 @@ services:
       - internal
     deploy:
       labels:
-          backupbot.backup: "true"
-          backupbot.backup.pre-hook: "mkdir -p /tmp/backup/ && PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /tmp/backup/backup.sql"
-          backupbot.backup.post-hook: "rm -rf /tmp/backup"
-          backupbot.backup.path: "/tmp/backup/"
+        - "backupbot.backup=true"
+        - "backupbot.backup.pre-hook=sh -c 'PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /tmp/backup.sql'"
+        - "backupbot.backup.path=/tmp/"
 volumes:
   postgres:
   codimd_uploads: