add dispatch docs workflow

.github/workflows/docs.yml

@@ -0,0 +1,21 @@
+name: Docs
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  dispatch:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.DOCS_TOKEN }}
+          script: |
+            await github.rest.actions.createWorkflowDispatch({
+              owner: 'velopack',
+              repo: 'velopack.website',
+              workflow_id: 'build.yml',
+              ref: 'master'
+            })