feat: demo deployment action

[sbellone]

New GitHub Action that will build and push our demo when develop is updated.

Demo patch

I've generated a patch containing all changes between develop and the current demo branch:

$ git diff develop..demo --binary > algolia-demo.patch

Workflow

The GitHub Action will:

• Checkout the develop branch (${{ github.ref_name }} points on the branch that triggered the workflow (doc))
• Generate the algolia-config.json and commerce-api-config.json files using jq to inject variables and secrets from env vars (c.f. jq doc).
• Apply the algolia-demo.patch
• Build and push the bundle

I've created all necessary variables and used my Managed Runtime API Key for the MRT_API_KEY secret.

Test

I've tested the workflow on a temporary fork and was able to push a bundle: https://github.com/sbellone/algolia-pwa-demo/actions/runs/11109886226/job/30866297606

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SFCC-384