ci: fix .ssh mount

.gitea/workflows/push.yaml

@@ -8,6 +8,8 @@ jobs:
     build:
         container:
             image: focs.ji.sjtu.edu.cn:5000/gitea/runner-images:ubuntu-latest
+            volumes:
+                - /home/actions/.ssh:/root/.ssh
         steps:
             - name: Check out repository code
               uses: https://gitea.com/BoYanZh/checkout@focs
@@ -24,6 +26,7 @@ jobs:
               run: |
                   go env -w GO111MODULE=on
                   go env -w GOPROXY=https://goproxy.io,direct
+                  chown -R root:root /root/.ssh
             - name: Build
               run: make build
             - name: Check images