Fix: use GIT_TOKEN secret (GITEA_TOKEN is reserved)

.gitea/workflows/preview.yml

@@ -161,7 +161,7 @@ jobs:
           HOST="pr-${PR_ID}.${BASE_DOMAIN}"
           curl -s -X POST \
             "https://git.euphon.cloud/api/v1/repos/${{ github.repository }}/issues/${PR_ID}/comments" \
-            -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+            -H "Authorization: token ${{ secrets.GIT_TOKEN }}" \
             -H "Content-Type: application/json" \
             -d "{\"body\": \"🚀 Preview deployed: https://${HOST}\n\nDB is a copy of production. Changes here won't affect prod.\"}"
 
@@ -185,6 +185,6 @@ jobs:
           PR_ID="${{ github.event.pull_request.number }}"
           curl -s -X POST \
             "https://git.euphon.cloud/api/v1/repos/${{ github.repository }}/issues/${PR_ID}/comments" \
-            -H "Authorization: token ${{ secrets.GITEA_TOKEN }}" \
+            -H "Authorization: token ${{ secrets.GIT_TOKEN }}" \
             -H "Content-Type: application/json" \
             -d "{\"body\": \"🗑️ Preview environment torn down.\"}"