use hardcoded gitea url and main branch for pr creation

.gitea/workflows/handy-update.yml

@@ -95,7 +95,7 @@ jobs:
         run: |
           set -euo pipefail
 
-          api="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
+          api="https://gitea.unrail.xyz/api/v1/repos/thomas/nixos-config"
           branch="bot/handy-${{ steps.update.outputs.version }}"
 
           existing=$(curl -fsS \
@@ -116,7 +116,7 @@ jobs:
           {
             \"title\": \"update handy to ${{ steps.update.outputs.version }}\",
             \"head\": \"${branch}\",
-            \"base\": \"${GITHUB_REF_NAME}\",
+            \"base\": \"main\",
             \"body\": \"automated update of handy appimage version and hash\"
           }
           JSON