element-web/.github/workflows/netlify.yaml

name: Upload Preview Build to Netlify
on:
    workflow_run:
        workflows: ["Layered Preview Build"]
        types:
            - completed
jobs:
    build:
        runs-on: ubuntu-latest
        if: >
            ${{ github.event.workflow_run.conclusion == 'success' }}
        steps:
            # There's a 'download artifact' action but it hasn't been updated for the
            # workflow_run action (https://github.com/actions/download-artifact/issues/60)
            # so instead we get this mess:
            - name: 'Download artifact'
              uses: actions/github-script@v3.1.0
              with:
                script: |
                  var artifacts = await github.actions.listWorkflowRunArtifacts({
                     owner: context.repo.owner,
                     repo: context.repo.repo,
                     run_id: ${{github.event.workflow_run.id }},
                  });
                  var matchArtifact = artifacts.data.artifacts.filter((artifact) => {
                    return artifact.name == "previewbuild"
                  })[0];
                  var download = await github.actions.downloadArtifact({
                     owner: context.repo.owner,
                     repo: context.repo.repo,
                     artifact_id: matchArtifact.id,
                     archive_format: 'zip',
                  });
                  var fs = require('fs');
                  fs.writeFileSync('${{github.workspace}}/previewbuild.zip', Buffer.from(download.data));

                  var prInfoArtifact = artifacts.data.artifacts.filter((artifact) => {
                    return artifact.name == "pr.json"
                  })[0];
                  var download = await github.actions.downloadArtifact({
                     owner: context.repo.owner,
                     repo: context.repo.repo,
                     artifact_id: prInfoArtifact.id,
                     archive_format: 'zip',
                  });
                  var fs = require('fs');
                  fs.writeFileSync('${{github.workspace}}/pr.json.zip', Buffer.from(download.data));
            - name: Extract Artifacts
              run: unzip -d webapp previewbuild.zip && rm previewbuild.zip && unzip pr.json.zip && rm pr.json.zip
            - name: 'Read PR Info'
              id: readctx
              uses: actions/github-script@v3.1.0
              with:
                script: |
                    var fs = require('fs');
                    var pr = JSON.parse(fs.readFileSync('${{github.workspace}}/pr.json'));
                    console.log(`::set-output name=prnumber::${pr.number}`);
            - name: Deploy to Netlify
              id: netlify
              uses: nwtgck/actions-netlify@v1.2
              with:
                  publish-dir: webapp
                  deploy-message: "Deploy from GitHub Actions"
                  # These don't work because we're in workflow_run
                  enable-pull-request-comment: false
                  enable-commit-comment: false
              env:
                  NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
                  NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
              timeout-minutes: 1
            - name: Edit PR Description
              uses: velas/pr-description@v1.0.1
              env:
                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
              with:
                  pull-request-number: ${{ steps.readctx.outputs.prnumber }}
                  description-message: |
                      Preview: ${{ steps.netlify.outputs.deploy-url }}
                      ⚠️ Do you trust the author of this PR? Maybe this build will steal your keys or give you malware. Exercise caution. Use test accounts.