feat: Add automated LiteFS backups and GitHub deployment workflow

entrypoint.sh

@@ -16,6 +16,25 @@ PRIMARY_TAGS='["navidrome","web","traefik.enable=true","urlprefix-/navidrome","t
 
 # --- Helper Functions ---
 
+# Backup Database (Only on Primary)
+run_backup() {
+  local backup_dir="/shared_data/backup"
+  local timestamp=$(date +%Y%m%d_%H%M%S)
+  local backup_file="${backup_dir}/navidrome.db_${timestamp}.bak"
+  
+  echo "Backing up database to ${backup_file}..."
+  mkdir -p "$backup_dir"
+  
+  if litefs export -name navidrome.db "$backup_file"; then
+    echo "Backup successful."
+    # Keep only last 7 days
+    find "$backup_dir" -name "navidrome.db_*.bak" -mtime +7 -delete
+    echo "Old backups cleaned."
+  else
+    echo "ERROR: Backup failed!"
+  fi
+}
+
 # Register Service with TTL Check
 register_service() {
   echo "Promoted! Registering service ${SERVICE_ID}..."
@@ -86,6 +105,9 @@ echo "Consul: $CONSUL_HTTP_ADDR"
 # Small sleep to let LiteFS settle and leadership election complete
 sleep 5
 
+LAST_BACKUP_TIME=0
+BACKUP_INTERVAL=86400 # 24 hours
+
 while true; do
   # In LiteFS 0.5, .primary file exists ONLY on replicas.
   if [ ! -f "$DB_LOCK_FILE" ]; then
@@ -103,6 +125,13 @@ while true; do
     # 2. Maintain the heartbeat (TTL)
     pass_ttl
     
+    # 3. Handle periodic backup
+    CURRENT_TIME=$(date +%s)
+    if [ $((CURRENT_TIME - LAST_BACKUP_TIME)) -ge $BACKUP_INTERVAL ]; then
+      run_backup
+      LAST_BACKUP_TIME=$CURRENT_TIME
+    fi
+    
   else
     # === WE ARE REPLICA ===
     
@@ -111,6 +140,8 @@ while true; do
       echo "Lost leadership. Demoting..."
       stop_app
       deregister_service
+      # Reset backup timer so the next primary can start fresh or we start fresh if promoted again
+      LAST_BACKUP_TIME=0
     fi
     
     # No service registration exists for replicas to keep Consul clean.