I made a flag waver bot for this community.
call it with !wave in the comments or post body.

EDIT: there seems to be a bug in the bot library i'm using and it will reply anywhere on lemmy as long as I am subscribed to the community. I may shut the bot down until this is fixed to prevent spam.

EDIT2: It should be working now, I added a workaround for the library bug and opened a github issue.

Update: I have added body text waving and waving of multiple links in a post. Also waving links in comments.
Example (see comments):
test image
another link

Update 2: It's open source now!!
github

Update3: lemmy.world is not federating with my instance for some reason, I can make comments but none of your comments are reaching my instance and the bot is not responding.

I've run some tests and the issue here is lemmy.world, I can see a post I made to !vexillologyjerk@lemmy.antemeridiem.xyz but not !vexillology@lemmy.world the issue seems to be intermittent starting and stopping throughout the day, needless to say there isn't anything I can do about this, sorry.
~~It might be because I'm still on 0.17.4 but my server won't run 0.18.0 and the bot won't run on that version.~~ nvm lemmy.world is also on 0.17.4, I have not idea what this issue is