Create trigger-ga-vmi-pipeline-on-release.yml (#3421)

The is automating the creation and publishing of VMIs to GCP when a new
version of bacalhau is released.

---------

Co-authored-by: Forrest <6546409+frrist@users.noreply.github.com>

.github/workflows/trigger-ga-vmi-pipeline-on-release.yml

@@ -0,0 +1,22 @@
+name: Build VMI on Bacalhau Release
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  handle-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+
+      - name: Trigger VMI Build
+        env:
+        run: |
+          curl -X POST \
+          -H "Authorization: token ${{ secrets.BACALHAU_VMI_DEPLOYMENT_SECRET }}" \
+          -H "Accept: application/vnd.github.v3+json" \
+          "https://api.github.com/repos/$REPO/dispatches" \
+          -d '{"event_type": "new-version-release", "client_payload": {"release_tag": "${{ github.ref_name }}"} }'