Add trigger to initiate website rebuild (#58)

* Add trigger to initiate website rebuild
Requires PAT_TOKEN secret to be configured with actions permission on the site repo.

* Rename PAT

Author: innovate-invent

.github/workflows/update_website.yaml

@@ -0,0 +1,19 @@
+name: Trigger website update
+on:
+  push:
+    tags: "v*"
+jobs:
+  dispatch:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/github-script@v6
+      with:
+        github-token: "${{ secrets.PERSONAL_ACCESS_TOKEN }}"
+        script: |
+          await github.rest.actions.createWorkflowDispatch({
+            owner: 'jmespath-community',
+            repo: 'jmespath.site',
+            workflow_id: 'build.yaml',
+            ref: 'master',
+            inputs: { version: '${{ github.ref_name }}' }
+          })