ci: allow manual workflow_dispatch to deploy staging

[parth0025]

Why

A manual run of the deploy workflow (Actions tab → Run workflow, i.e. workflow_dispatch) only ran the validate job and skipped deploy, because the deploy job was gated on if: github.event_name == 'push'. So there was no way to rebuild + redeploy staging after a server-side env change without pushing a throwaway commit.

What

Allow workflow_dispatch to deploy too:

if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'

Merging this is itself a push to staging, which triggers a normal build+deploy. After this, manual redeploys work straight from the Actions tab.

🤖 Generated with Claude Code

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