fix(backup): single-file mysqldump backup + reimport-on-restore hook

The previous recipe backed the DB up as a mysqldump --tab into /var/lib/mysql-files with NO restore
hook (and the mysql data volume itself was not backupbot-labelled), so a restored backup silently
kept the live, un-restored DB state — data loss on restore. Add mysql_backup.sh (backup: gzipped
mysqldump --databases ghost into the data volume; restore: reimport it) wired via backupbot
backup.pre-hook + restore.post-hook, mirroring the postgres recipes (mattermost-lts, immich). Bump
1.2.0 -> 1.3.0.

abra.sh

@@ -1 +1,2 @@
 export GHOST_ENTRYPOINT_VERSION=v1
+export MYSQL_BACKUP_VERSION=v1

compose.yml

@@ -51,7 +51,7 @@ services:
         - "traefik.http.middlewares.${STACK_NAME}-redirect.redirectscheme.permanent=true"
         - "backupbot.backup=true"
         - "backupbot.backup.path=/var/lib/ghost/content"
-        - "coop-cloud.${STACK_NAME}.version=1.2.0+6.21.2-alpine"
+        - "coop-cloud.${STACK_NAME}.version=1.3.0+6.21.2-alpine"
     healthcheck:
       test: ["CMD", "wget", "--header=X-Forwarded-Proto: https", "--spider", "-q", "http://localhost:2368/ghost/api/admin/site"]
       interval: 30s
@@ -67,14 +67,19 @@ services:
       MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db_password
     secrets:
       - db_password
+    configs:
+      - source: mysql_backup
+        target: /mysql_backup.sh
+        mode: 0555
     volumes:
       - "mysql:/var/lib/mysql"
     deploy:
       labels:
         - "backupbot.backup=true"
-        - "backupbot.backup.pre-hook=mysqldump -u root -p\"$$(cat /run/secrets/db_password)\" ghost --tab /var/lib/mysql-files/"
+        - "backupbot.backup.pre-hook=/mysql_backup.sh backup"
-        - "backupbot.backup.post-hook=rm -rf /var/lib/mysql-files/*"
+        - "backupbot.backup.post-hook=rm -f /var/lib/mysql/backup.sql.gz"
-        - "backupbot.backup.path=/var/lib/mysql-files/"
+        - "backupbot.backup.path=/var/lib/mysql/backup.sql.gz"
+        - "backupbot.restore.post-hook=/mysql_backup.sh restore"
 
     healthcheck:
       test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-p\"$$(cat /run/secrets/db_password)\""]
@@ -104,3 +109,6 @@ configs:
   ghost_entrypoint:
     name: ${STACK_NAME}_ghost_entrypoint_${GHOST_ENTRYPOINT_VERSION}
     file: entrypoint.sh
+  mysql_backup:
+    name: ${STACK_NAME}_mysql_backup_${MYSQL_BACKUP_VERSION}
+    file: mysql_backup.sh

mysql_backup.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+# MySQL backup/restore hook for the `db` service. Invoked by backupbot-two via:
+#   backupbot.backup.pre-hook   = "/mysql_backup.sh backup"
+#   backupbot.backup.path       = "/var/lib/mysql/backup.sql.gz"
+#   backupbot.restore.post-hook = "/mysql_backup.sh restore"
+# Backup dumps the `ghost` DB to a single gzipped file inside the mysql data volume; backupbot
+# archives it. Restore reimports it. The previous recipe shipped a `mysqldump --tab` backup with NO
+# restore hook (and the mysql data volume itself was not backed up), so a restored backup silently
+# kept the live, un-restored DB state — data loss on restore.
+
+set -e
+
+BACKUP_FILE="/var/lib/mysql/backup.sql.gz"
+export MYSQL_PWD="$(cat "${MYSQL_ROOT_PASSWORD_FILE:-/run/secrets/db_password}")"
+DB_NAME="ghost"
+
+function backup {
+  mysqldump -u root --single-transaction --routines --triggers --databases "$DB_NAME" | gzip > "$BACKUP_FILE"
+}
+
+function restore {
+  # --databases dump carries CREATE DATABASE/USE + per-table DROP+CREATE (mysqldump default), so the
+  # reimport deterministically rebuilds every table from the archived dump.
+  gunzip -c "$BACKUP_FILE" | mysql -u root
+}
+
+$@