collect.sh: fix invalidate json

dracut.module/90metadata-collect/collect.sh

@@ -11,9 +11,9 @@ timestamp_cmd='date +"%Y/%m/%d %H:%M %Z"'
 flb_pid=$!
 
 sleep 1 # let fluent-bit be ready to listen to the log file
-echo "{beginning_date: \"$(eval "$timestamp_cmd")\"}" >> $log_file
+echo "{\"beginning_date\": \"$(eval "$timestamp_cmd")\"}" >> $log_file
 /sbin/metadata-collect-agent $NEWROOT/usr/bin $log_file
 /sbin/metadata-collect-agent $NEWROOT/usr/sbin $log_file
-echo "{end_date: \"$(eval "$timestamp_cmd")\", end_marker: \"fluentbit_end\"}" >> $log_file
+echo "{\"end_date\": \"$(eval "$timestamp_cmd")\", \"end_marker\": \"fluentbit_end\"}" >> $log_file
 
 wait $flb_pid