Adds action to update README on new backer (#2900)

* Adds action to update README on new backer

* Updated readme commit action

* Updated workflow to be triggered manually

.github/workflows/sponsors.yml

@@ -0,0 +1,29 @@
+name: Generate Sponsors README
+on: workflow_dispatch
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Generate Sponsors
+        uses: JamesIves/github-sponsors-readme-action@v1
+        with:
+          token: ${{ secrets.SPONSORS_PAT }}
+          file: "README.md"
+          minimum: 500
+          maximum: 9900
+          marker: "backers"
+          organization: true
+
+      # Here we can eventually add sponsors too rather than just backers
+
+      - name: Commit changes
+        run: |
+          git config --global user.email "bot@vapor.codes"
+          git config --global user.name "VaporBot"
+          git config --global credential.helper cache
+          git add README.md
+          git diff-index --quiet HEAD || git commit -m "Automatic update of README.md after new sponsor joined"
+          git push https://VaporBot:${{secrets.SPONSORS_PAT}}@github.com/vapor/vapor main

README.md

@@ -70,6 +70,8 @@ Support Vapor's development by [becoming a sponsor](https://github.com/sponsors/
 ### 💚 Backers
 Support Vapor's development by [becoming a backer](https://github.com/sponsors/vapor).
 
+<!-- backers -->
+
 <a 
     data-amt="50" 
     data-since="10/09/20" 
@@ -437,6 +439,8 @@ Support Vapor's development by [becoming a backer](https://github.com/sponsors/v
     <img src="https://avatars.githubusercontent.com/u/1652009?s=120" width="60px">
 </a>
 
+<!-- backers -->
+
 <a href="https://opencollective.com/vapor/backer/0/website" target="_blank"><img src="https://opencollective.com/vapor/backer/0/avatar.svg"></a>
 <a href="https://opencollective.com/vapor/backer/1/website" target="_blank"><img src="https://opencollective.com/vapor/backer/1/avatar.svg"></a>
 <a href="https://opencollective.com/vapor/backer/2/website" target="_blank"><img src="https://opencollective.com/vapor/backer/2/avatar.svg"></a>