Add github actions to generate codelab

.github/workflows/preview_deploy.yml

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+name: Deploy Preview
+on: 
+  workflow_run:
+    workflows: ["Generate Preview"]
+    types:
+      - completed
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    if: >
+      ${{ github.event.workflow_run.event == 'pull_request' &&
+      github.event.workflow_run.conclusion == 'success' }}
+    steps:
+      - name: 'Download artifact'
+        uses: actions/[email protected]
+        with:
+          script: |
+            var artifacts = await github.actions.listWorkflowRunArtifacts({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               run_id: ${{ github.event.workflow_run.id }},
+            });
+            var matchPrArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "pr"
+            })[0];
+            var matchPreviewArtifact = artifacts.data.artifacts.filter((artifact) => {
+              return artifact.name == "preview"
+            })[0];
+            var downloadPr = await github.actions.downloadArtifact({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               artifact_id: matchPrArtifact.id,
+               archive_format: 'zip',
+            });
+            var downloadPreview = await github.actions.downloadArtifact({
+               owner: context.repo.owner,
+               repo: context.repo.repo,
+               artifact_id: matchPreviewArtifact.id,
+               archive_format: 'zip',
+            });
+            var fs = require('fs');
+            fs.writeFileSync('${{github.workspace}}/pr.zip', Buffer.from(downloadPr.data));
+            fs.writeFileSync('${{github.workspace}}/firebase-rules.zip', Buffer.from(downloadPreview.data));
+      - run: |
+          unzip pr.zip
+          echo "pr_number=$(cat NR)" >> $GITHUB_ENV
+          mkdir firebase-rules
+          unzip firebase-rules.zip -d firebase-rules
+      - name: Deploy preview
+        id: deploy_preview
+        uses: FirebaseExtended/action-hosting-deploy@v0
+        with:
+          repoToken: '${{ secrets.GITHUB_TOKEN }}'
+          firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_FIR_CODELABS_89252 }}'
+          projectId: fir-codelabs-89252
+          entryPoint: firebase-rules
+          channelId: ${{ env.pr_number }}
+        env:
+          FIREBASE_CLI_PREVIEWS: hostingchannels
+      - name: Write Comment
+        uses: actions/github-script@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            await github.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: ${{ env.pr_number }},
+              body: 'View preview ${{ steps.deploy_preview.outputs.details_url }}'
+            });

.github/workflows/preview_generate.yml

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+name: Generate Preview
+on:
+  pull_request:
+    paths:
+    - 'steps/**'
+jobs:
+  build_and_preview:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Go environment
+        uses: actions/[email protected]
+      - name: Generate preview
+        working-directory: ./steps
+        run: |
+          go get github.com/googlecodelabs/tools/claat
+          $HOME/go/bin/claat export index.lab.md
+      - name: Save PR number
+        run: |
+          mkdir -p ./pr
+          echo ${{ github.event.number }} > ./pr/NR
+      - uses: actions/upload-artifact@v2
+        with:
+          name: preview
+          path: steps/firebase-rules/
+      - uses: actions/upload-artifact@v2
+        with:
+          name: pr
+          path: pr/