use sed to replace chars in title

.github/workflows/deployBlocker.yml

@@ -22,6 +22,13 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ github.token }}
 
+      - name: Escape html characters in GH issue title
+        env:
+          GH_ISSUE_TITLE: ${{ github.event.issue.title }}
+        run: |
+          escaped_title=$(echo "$GH_ISSUE_TITLE" | sed -e 's/&/\&amp;/g; s/</\&lt;/g; s/>/\&gt;/g; s/"/\&quot;/g; s/'"'"'/\&#039;/g; s/|/\&verbar;/g')
+          echo "GH_ISSUE_TITLE=$escaped_title" >> "$GITHUB_ENV"
+
       - name: 'Post the issue in the #expensify-open-source slack room'
         if: ${{ success() }}
         uses: 8398a7/action-slack@v3
@@ -32,7 +39,7 @@ jobs:
               channel: '#expensify-open-source',
               attachments: [{
                 color: "#DB4545",
-                text: '💥 We have found a New Expensify Deploy Blocker, if you have any idea which PR could be causing this, please comment in the issue: <${{ github.event.issue.html_url }}|${{ github.event.issue.title | escape }}>'
+                text: '💥 We have found a New Expensify Deploy Blocker, if you have any idea which PR could be causing this, please comment in the issue: <${{ github.event.issue.html_url }}|${{ env.GH_ISSUE_TITLE }}>'
               }]
             }
         env: