ci: Connect Netlify preview to cloud database

[nikiburggraf]

Maybe also spin up cloud server when a PR is created as a gh action

[nikiburggraf]

maybe add job to existing webpreview workflow
maybe add aws creds to gh repo secrets
check readme to grab/push anon key and URL to flutter -- whatever way is more secure -- may need to decrypt/recrypt

[nikiburggraf]

1. create custom gh action
2. add gh workflow
   1. workflow dispatch (same as 1)
3. Add job in web preview
   1. spin up test service (same as 1)

jobs:
   steps:
       - name: deploy-test
          uses: ./actions/deploytest

doublecheck permissions for actions/workflows bc don't want arbitrary folks to be able to spend aws money

• can do a toy example by creating something personally and having don try to dispatch the workflow