preview_build.yml

# This action builds and deploys egui_demo_app on each pull request created
# Security notes:
# This action is split in two workflows, preview_build and preview_deploy.
# `preview_build` runs on pull_request, so it won't have any access to the repositories secrets, so it is safe to execute
# untrusted code.
# `preview_deploy` has access to the repositories secrets (so it can push to the pr preview repo) but won't run
# any untrusted code (it will just extract the build artifact and push it to the pages branch where it will
# automatically be deployed).

name: Preview Build

on:
  - pull_request

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: rustup toolchain install stable --profile minimal --target wasm32-unknown-unknown
      - uses: Swatinem/rust-cache@v2
        with:
          prefix-key: "pr-preview-"

      - name: "Install wasmopt / binaryen"
        run: |
          sudo apt-get update && sudo apt-get install binaryen

      - run: |
          scripts/build_demo_web.sh --release

      - uses: actions/upload-artifact@v4
        with:
          name: web_demo
          path: web_demo

      - name: Generate meta.json
        env:
          PR_NUMBER: ${{ github.event.number }}
          PR_BRANCH: ${{ github.head_ref }}
        run: |
          echo "{\"pr_number\": \"$PR_NUMBER\", \"pr_branch\": \"$PR_BRANCH\"}" > meta.json

      - uses: actions/upload-artifact@v4
        with:
          name: meta.json
          path: meta.json