chore(ci): add github action for deployment (#160)

This adds a Github action to invoke the deployment workflow hosted in our infra repository.

.github/workflows/deploy.yml

@@ -0,0 +1,21 @@
+name: Deploy
+on:
+  push:
+    branches:
+      - main
+      - staging
+
+jobs:
+  trigger-deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Trigger deployment workflow
+    - run: |
+        gh api --method POST \
+          -H "Accept: application/vnd.github+json" -H "X-GitHub-Api-Version: 2022-11-28" \
+          /repos/ipshipyard/waterworks-infra/dispatches \
+          -f "event_type=deploy" \
+          -F "client_payload[git_sha]=${GITHUB_SHA}" \
+          -F "client_payload[git_ref]=${GITHUB_REF}"
+      env:
+        GH_TOKEN: ${{ secrets.DEPLOYMENT_GITHUB_PAT }}