Set up GitHub Action to post to social media a list of new modules of the month/week

[jfy133]

Is your feature request related to a problem? Please describe.
We currently have automated social media posts for each new release of a pipeline.

However pipelines are only one small part of the nf-core ecosystem, and it could be good to 'advertise' the diversity of modules that we also make available for community.

Describe the solution you'd like
A GitHub action that:

1. Gathers a list of new modules created that month
2. Make a social media post with relevant hashtags/descriptions for each new module (probably in a thread, deriving metadata from the module's meta.yaml)
3. Run once a month (suggested by @nvnieuwk )

An example poist:

nf-core Module Monthly Minutes!

What has the #nf-core module developers made this month?
See the thread below for a list of new open-source #Nextflow modules now freely available for use in your own #bioinformatics (and more!) pipelines 👇 

New nf-core module alert!

Name: MEGAHIT
Description: An ultra-fast metagenomic assembler for large and complex metagenomics
Keywords: #megahit #denovo #assembly #debuijn #metagenomics

Interested? Instructions here: https://nf-co.re/modules/megahit/

Or something like that...

Maybe even weekly would be fine

Describe alternatives you've considered
Maybe not worth it if we feel it would be too spaamy.

Additional context
@mashehu already points out we have a database of when new modules were created etc, so it might not be too hard.