add netlify workflow_call

.github/workflows/netlify.yaml

@@ -0,0 +1,84 @@
+name: Netlify - Deploy
+on:
+  workflow_call:
+    inputs:
+      pr_number:
+        required: true
+      pr_head_full_name:
+        required: true
+      pr_head_ref:
+        required: true
+      deployment_ref:
+        required: true
+    secrets:
+      ELEMENT_BOT_TOKEN:
+        required: true
+      NETLIFY_AUTH_TOKEN:
+        required: true
+      NETLIFY_SITE_ID:
+        required: true
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      deployments: write
+    environment: Netlify
+    steps:
+      - run: ${{ tojson(github.event) }}
+        shell: cat {0}
+
+      - name: 📝 Create Deployment
+        uses: bobheadxi/deployments@v1
+        id: deployment
+        with:
+          step: start
+          token: ${{ secrets.GITHUB_TOKEN }}
+          env: Netlify
+          ref: ${{ inputs.deployment_ref }}
+          desc: |
+            Do you trust the author of this PR? Maybe this build will steal your keys or give you malware.
+            Exercise caution. Use test accounts.
+
+      - name: 📥 Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          github-token: ${{ secrets.ELEMENT_BOT_TOKEN }}
+          run-id: ${{ github.event.workflow_run.id }}
+          name: build-output
+          path: webapp
+
+      - name: Add redirects file
+        # We fetch from github directly as we don't bother checking out the repo
+        run: curl -s https://raw.githubusercontent.com/element-hq/element-call/main/config/netlify_redirects > webapp/_redirects
+
+      - name: Add config file
+        run: curl -s "https://raw.githubusercontent.com/${{ inputs.pr_head_full_name }}/${{ inputs.pr_head_ref }}/config/element_io_preview.json" > webapp/config.json
+
+      - name: ☁️ Deploy to Netlify
+        id: netlify
+        uses: nwtgck/actions-netlify@v3.0
+        with:
+          publish-dir: webapp
+          deploy-message: "Deploy from GitHub Actions"
+          alias: pr${{ inputs.pr_number }}
+        env:
+          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
+        timeout-minutes: 1
+
+      - name: 🚦 Update deployment status
+        uses: bobheadxi/deployments@v1
+        if: always()
+        with:
+          step: finish
+          override: false
+          token: ${{ secrets.GITHUB_TOKEN }}
+          status: ${{ job.status }}
+          env: ${{ steps.deployment.outputs.env }}
+          deployment_id: ${{ steps.deployment.outputs.deployment_id }}
+          env_url: ${{ steps.netlify.outputs.deploy-url }}
+          desc: |
+            Do you trust the author of this PR? Maybe this build will steal your keys or give you malware.
+            Exercise caution. Use test accounts.
+