Fix Discord webhook env passing

Author: Skyllie

.github/workflows/discord-notify.yml

@@ -9,5 +9,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Send Discord notification
+        env:
+          DISCORD_WEBHOOK: ${{ secrets.DISCORD_WEBHOOK }}
+          PR_TITLE: ${{ github.event.pull_request.title }}
+          PR_AUTHOR: ${{ github.event.pull_request.user.login }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
         run: |
-          curl -H "Content-Type: application/json" -d "{\"content\": \"🔔 New Pull Request opened: **${{ github.event.pull_request.title }}** by ${{ github.event.pull_request.user.login }}\n${{ github.event.pull_request.html_url }}\"}" ${{ secrets.DISCORD_WEBHOOK }}
+          curl -H "Content-Type: application/json" -d "{\"content\": \"New Pull Request opened: **${PR_TITLE}** by ${PR_AUTHOR} - ${PR_URL}\"}" "$DISCORD_WEBHOOK"