It should work

.gitea/workflows/deploy.yml

@@ -30,8 +30,8 @@ jobs:
 
       - name: Deploy to server
         run: |
-          scp build.tar.gz deploy@aranroig.deploy:/tmp/
+          scp -i ${{ secrets.DEPLOY_KEY_LOCATION }} build.tar.gz deploy@${{ secrets.DEPLOY_HOST }}:/tmp/
-          ssh deploy@aranroig.deploy << 'EOF'
+          ssh -i ${{ secrets.DEPLOY_KEY_LOCATION }} deploy@{{ secrets.DEPLOY_HOST }} << 'EOF'
             rm -rf /var/www/app/.output
             tar -xzf /tmp/build.tar.gz -C /var/www/app
             sudo systemctl restart app