ci: add manual workflow_dispatch trigger (#302)

Adds `workflow_dispatch` trigger to the CI/CD pipeline so it can be
manually triggered from the Actions tab.

Co-authored-by: Kpa-clawbot <259247574+Kpa-clawbot@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/workflows/deploy.yml

@@ -5,6 +5,7 @@ on:
     branches: [master]
   pull_request:
     branches: [master]
+  workflow_dispatch:
 
 concurrency:
   group: ci-${{ github.event.pull_request.number || github.ref }}