ci(push): test ssh key in secrets

.gitea/workflows/push.yaml

@@ -8,8 +8,6 @@ jobs:
     build:
         container:
             image: focs.ji.sjtu.edu.cn:5000/gitea/runner-images:golang-ubuntu-latest
-            volumes:
-                - /home/actions/.ssh:/root/.ssh
         steps:
             - name: Check out repository code
               uses: https://gitea.com/BoYanZh/checkout@focs
@@ -19,7 +17,10 @@ jobs:
               run: |
                   go env -w GO111MODULE=on
                   go env -w GOPROXY=https://goproxy.io,direct
-                  chown -R root:root /root/.ssh
+                  mkdir -p ~/.ssh
+                  echo "${{ secrets.DEPLOY_KEY }}" > ~/.ssh/id_ed25519
+                  chmod 600 ~/.ssh/id_ed25519
+              shell: bash
             - name: Determine build command
               id: build_command
               run: |