common: backup_mysql_database: Adapted script to structure of backup_files

roles/common/templates/backup_mysql_database.sh

@@ -2,9 +2,14 @@
 
 set -euxo pipefail;
 
-file={{ backups_mysql_database_directory | quote }}"/$1.sql.gpg";
+# Arguments
+db="$1";
 
-mysqldump --opt --databases "$1" |
+# Variables
+file={{ backups_mysql_database_directory | quote }}"/$db.sql.gpg";
+
+# Execution
+mysqldump --opt --databases "$db" |
   pv --quiet --buffer-size 256M |
   gpg --quiet --no-verbose --encrypt --recipient {{ backup_gpg_fingerprint | quote }} --trust-model always > "$file";
 chmod u+r-wx,g+r-wx,o+r-wx "$file";