fix: use random temporary file names in dburl dotenv

scripts/backup-mysql.sh

@@ -21,9 +21,12 @@ DB_URL="$1";
 # - $DB_PORT
 # - $DB_NAME
 # - any query var as a prefixed variable $db_arg_${name}=${value}
-dburl-parser.sh ${DB_URL} > /tmp/ofelia.dotenv;
-source /tmp/ofelia.dotenv;
-rm /tmp/ofelia.dotenv;
+dotenv_path="/tmp/ofelia-$(
+    tr -dc A-Za-z0-9 </dev/urandom | head -c 16; echo
+    ).dotenv"
+dburl-parser.sh ${DB_URL} > ${dotenv_path};
+source ${dotenv_path};
+rm ${dotenv_path};
 
 # set backup destination
 if test -z "${BACKUP_DATABASES_PATH}"; then