Maybe?

.gitea/workflows/pe-docker.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
     - name: Pull latest from Git
       run: |
-           echo "${{ gitea }}"
+           echo "${{ gitea.ref_name }}"
            pwd
            whoami
            mkdir -p /var/lib/act_runner/
@@ -30,7 +30,7 @@ jobs:
              cd nodbot
              git pull
            fi
-           git checkout ${{ gitea.ref}}
+           git checkout ${{ gitea.ref_name }}
     - name: Build the Docker image
       run: |
            cd /var/lib/act_runner/nodbot