Workflow fixes

Signed-off-by: Tommy <contact@tommytran.io>

.github/workflows/firebase-hosting-pull-request.yml

@@ -39,11 +39,19 @@ jobs:
       - name: Remove artifact zip
         run: rm hugo.zip
 
+      #Extracting and deployment workflow copied from https://github.com/gpuweb/gpuweb/blob/main/.github/workflows/preview-pull-request.yml
+      - name: Find PR
+        if: ${{ github.event.workflow_run.event == 'pull_request' }}
+        run: |
+          PR=$(curl https://api.github.com/search/issues?q=${{ github.event.workflow_run.head_sha }} |
+          grep -Po "(?<=${{ github.event.workflow_run.repository.full_name }}\/pulls\/)\d*" | head -1)
+          echo "PR=$PR" >> $GITHUB_ENV
+
       - name: Deploy to Firebase
         uses: FirebaseExtended/action-hosting-deploy@v0
         with:
           repoToken: '${{ secrets.GITHUB_TOKEN }}'
           firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_PRIVSEC_356523 }}'
           projectId: privsec-356523
-          channelID: '$(cat .PR)'
+          channelId: prs-${{ env.PR }}-${{ github.event.workflow_run.head_sha }}
           expires: 30d

.github/workflows/pull-request-receiver.yml

@@ -24,11 +24,6 @@ jobs:
       - name: Build Hugo site
         run: hugo --minify
 
-      - name: Save PR number
-        run: |
-          mkdir -p ./pr
-          echo ${{ github.event.number }} > .PR
-
       - name: Upload artifact
         uses: actions/upload-artifact@v2
         with: