Fix build-publish workflow failure (#24)

Related to [this job failure](https://gitea.com/gitea/test-env/actions/runs/28/jobs/2)

See https://gitea.com/gitea/act_runner/issues/119#issuecomment-738294

Reviewed-on: https://gitea.com/gitea/test-env/pulls/24
Reviewed-by: Jason Song <i@wolfogre.com>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-committed-by: Zettat123 <zettat123@gmail.com>

.gitea/workflows/build-publish.yaml

@@ -36,6 +36,8 @@ jobs:
           CI_REGISTRY_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
     - name: build image
       uses: https://github.com/docker/build-push-action@v4
+      env:
+        ACTIONS_RUNTIME_TOKEN: ''
       with:
         push: true
         tags: gitea/test_env:linux-${{ matrix.go-version }}-${{ steps.arch.outputs.value }}

.gitea/workflows/dry-run.yaml

@@ -16,6 +16,8 @@ jobs:
       uses: https://github.com/docker/setup-buildx-action@v2
     - name: build image
       uses: https://github.com/docker/build-push-action@v4
+      env:
+        ACTIONS_RUNTIME_TOKEN: ''
       with:
         push: false
         tags: gitea/test_env:linux-${{ matrix.go-version }}-amd64