Update the workflow to target the main branch (#101)

# Pull Request

## 📖 Description

<!--- Provide some background and a description of your work. -->
Due to the updates needed for beachball to ensure a good workflow process for publishing, the `release` branch is renamed to `main` and pull requests must now be merged to `main`.

Refer to https://github.com/microsoft/fast-tooling/issues/78 for more details.

## 👩‍💻 Reviewer Notes

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Provide some notes for reviewers to help them provide targeted feedback and testing.
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Consider if there are any other locations where the `release` branch is referenced which should be changed to `main`.

## ✅ Checklist

### General

<!--- Review the list and put an x in the boxes that apply. -->

- [ ] I have added tests for my changes.
- [ ] I have tested my changes.
- [x] I have updated the project documentation to reflect my changes.

## ⏭ Next Steps

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If there is relevant follow-up work to this PR, please list any existing issues or provide brief descriptions of what you would like to do next.
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.github/workflows/ci-fast-tooling.yml

@@ -3,10 +3,10 @@ name: CI - FAST Tooling
 on:
   push:
     branches: 
-      - release
+      - main
   pull_request:
     branches: 
-      - release 
+      - main
 
 jobs:
   build: