Automate with GitHub Actions

[VKong6019]

issue: https://github.com/sandboxnu/boba-buddies/issues/31

hello this is my graduation

here's a rundown of how things will generally work:

1. the weeklyInteraction.yml file is configured so that the Slack bot will run every Sunday during the Fall and Spring Semester
2. the Slack bot will run the npm run weekly command that runs the weeklyInteractionScript.ts
3. this will either
   • pair people in whatever the boba buddies channel is
   • OR, send a check in to the current pairings
4. steps 1-3 repeats

Note on step 3: we use a boolean flag we have set in a dynamodb table. it's literally an on and off switch

Things left to do:

• [x] create the github secret keys
• [x] create new boba buddies channel for spring semester

Generally, this is pretty safe to merge rn cause the GitHub Action shouldn't fire off until january at least

[VKong6019]

after this is merged, I will update the notion wiki and info dump everything into there. you best believe I am a documentation god

heh, homage to pharmd