feat(backup): add backup script and refactor cron job to use it

terraform/modules/utils/scw_rclone/resources/backup.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+if [ -z "$SCW_ACCESS_KEY" ] || [ -z "$SCW_SECRET_KEY" ]; then
+  echo "SCW_ACCESS_KEY and SCW_SECRET_KEY must be set"
+  exit 1
+fi
+if [ -z "$BUCKET_NAME" ]; then
+  echo "BUCKET_NAME must be set"
+  exit 1
+fi
+if [ -z "$APP_NAME" ]; then
+  echo "APP_NAME must be set"
+  exit 1
+fi
+if [ -z "$BACKUP_RETENTION" ]; then
+  echo "BACKUP_RETENTION must be set"
+  exit 1
+fi
+
+envsubst < /etc/rclone.conf.tmpl > /tmp/rclone.conf
+unset $SCW_ACCESS_KEY
+unset $SCW_SECRET_KEY
+
+apk update
+apk add gettext
+tar -zcvpf /backup/$APP_NAME-files-`date +\"%Y%m%d\"`.tar.gz /files
+
+# Remove old backups
+BACKUP_FILE_PATTERN="$APP_NAME-files-*.tar.gz"
+find /backup -type f -name $BACKUP_FILE_PATTERN -mtime +$BACKUP_RETENTION | xargs --no-run-if-empty rm
+
+# Upload to Scaleway
+/usr/local/bin/rclone --config=/tmp/rclone.conf sync --progress /backup scaleway:$BUCKET_NAME/$APP_NAME-backup"