Preview PRs via Netlify + GitHub Actions (#167)

* Preview PRs via Netlify + GitHub Actions

* Fix spaces

.github/workflows/ci.yaml

@@ -1,17 +1,20 @@
 name: deploy-site
-
 on:
   push:
-    branches:
-      - main
-
+  pull_request:
+  workflow_dispatch:
 jobs:
-  deploy-site:
+  build:
     runs-on: ubuntu-latest
     defaults:
       run:
         shell: bash -l {0}
+    if: github.repository == 'ProjectPythia/projectpythia.github.io'
     steps:
+      - name: Cancel previous runs
+        uses: styfle/cancel-workflow-action@0.9.1
+        with:
+          access_token: ${{ github.token }}
       - uses: actions/checkout@v2
 
       - uses: conda-incubator/setup-miniconda@v2
@@ -30,9 +33,22 @@ jobs:
           conda env list
           cd portal
           make -j4 html
+      - name: Zip the site
+        run: |
+          set -x
+          set -e
+          if [ -f site.zip ]; then
+              rm -rf site.zip
+          fi
+          zip -r site.zip ./portal/_build/html
+      - uses: actions/upload-artifact@v2
+        with:
+          name: site-zip
+          path: ./site.zip
 
       - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3.7.3
+        if: github.ref == 'refs/heads/main'
+        uses: peaceiris/actions-gh-pages@v3.8.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./portal/_build/html

.github/workflows/preview.yaml

@@ -0,0 +1,130 @@
+name: preview-site
+on:
+  workflow_run:
+    workflows:
+      - deploy-site
+    types:
+      - requested
+      - completed
+jobs:
+  deploy:
+    if: github.repository == 'ProjectPythia/projectpythia.github.io'
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set message value
+        run: |
+          echo "comment_message=This pull request is being automatically built with [GitHub Actions](https://github.com/features/actions) and [Netlify](https://www.netlify.com/). To see the status of your deployment, click below." >> $GITHUB_ENV
+      - name: Find Pull Request
+        uses: actions/github-script@v4
+        id: find-pull-request
+        with:
+          script: |
+            let pullRequestNumber = ''
+            let pullRequestHeadSHA = ''
+            core.info('Finding pull request...')
+            const pullRequests = await github.pulls.list({owner: context.repo.owner, repo: context.repo.repo})
+            for (let pullRequest of pullRequests.data) {
+              if(pullRequest.head.sha === context.payload.workflow_run.head_commit.id) {
+                  pullRequestHeadSHA = pullRequest.head.sha
+                  pullRequestNumber = pullRequest.number
+                  break
+              }
+            }
+            core.setOutput('number', pullRequestNumber)
+            core.setOutput('sha', pullRequestHeadSHA)
+            if(pullRequestNumber === '') {
+              core.info(
+                 `No pull request associated with git commit SHA: ${context.payload.workflow_run.head_commit.id}`
+              )
+            }
+            else{
+              core.info(`Found pull request ${pullRequestNumber}, with head sha: ${pullRequestHeadSHA}`)
+            }
+      - name: Find Comment
+        uses: peter-evans/find-comment@v1
+        if: steps.find-pull-request.outputs.number != ''
+        id: fc
+        with:
+          issue-number: '${{ steps.find-pull-request.outputs.number }}'
+          comment-author: 'github-actions[bot]'
+          body-includes: '${{ env.comment_message }}'
+      - name: Create comment
+        if: |
+          github.event.workflow_run.conclusion != 'success'
+          && steps.find-pull-request.outputs.number != ''
+          && steps.fc.outputs.comment-id == ''
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          issue-number: ${{ steps.find-pull-request.outputs.number }}
+          body: |
+            ${{ env.comment_message }}
+
+            🚧 Deployment in progress for git commit SHA: ${{ steps.find-pull-request.outputs.sha }}
+      - name: Update comment
+        if: |
+          github.event.workflow_run.conclusion != 'success'
+          && steps.find-pull-request.outputs.number != ''
+          && steps.fc.outputs.comment-id != ''
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          edit-mode: replace
+          body: |
+            ${{ env.comment_message }}
+
+            🚧 Deployment in progress for git commit SHA: ${{ steps.find-pull-request.outputs.sha }}
+      - name: Download Artifact site
+        if: |
+          github.event.workflow_run.conclusion == 'success'
+          && steps.find-pull-request.outputs.number != ''
+          && steps.fc.outputs.comment-id != ''
+        uses: dawidd6/action-download-artifact@v2.14.1
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          workflow: ci.yaml
+          run_id: ${{ github.event.workflow_run.id }}
+          name: site-zip
+      - name: Unzip site
+        if:  |
+          github.event.workflow_run.conclusion == 'success'
+          && steps.find-pull-request.outputs.number != ''
+          && steps.fc.outputs.comment-id != ''
+        run: |
+          rm -rf ./portal/_build/html
+          unzip site.zip
+          rm -f site.zip
+      # Push the site's HTML to Netlify and get the preview URL
+      - name: Deploy to Netlify
+        if: |
+          github.event.workflow_run.conclusion == 'success'
+          && steps.find-pull-request.outputs.number != ''
+          && steps.fc.outputs.comment-id != ''
+        id: netlify
+        uses: nwtgck/actions-netlify@v1.2
+        with:
+          publish-dir: ./portal/_build/html
+          production-deploy: false
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          enable-commit-comment: false
+        env:
+          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
+          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}
+        timeout-minutes: 5
+      - name: Update site Preview comment
+        if: |
+          github.event.workflow_run.conclusion == 'success'
+          && steps.find-pull-request.outputs.number != ''
+          && steps.fc.outputs.comment-id != ''
+        uses: peter-evans/create-or-update-comment@v1
+        with:
+          comment-id: ${{ steps.fc.outputs.comment-id }}
+          edit-mode: replace
+          body: |
+            ${{ env.comment_message }}
+
+            🔍 Git commit SHA:  ${{ steps.find-pull-request.outputs.sha }}
+            ✅ Deployment Preview URL: ${{ steps.netlify.outputs.deploy-url }}