Github Actions job template that automates IaSQL code reviews

[depombo]

suggested by @yrobla. the Github actions job should take a pg connection string and assumes it will run on the repo it is in. It should have a button via workflow_dispatch hook that accepts a branch name to generate a PR on. markdown goes in transactions/ folder. Merging the PR triggers a CI job that calls iasql_commit with the URL to the PR which includes #