Wired permission denied,when connect to host could help me analysis where i am wrong

[joebnb]

in use ssh-deploy as readme recommend and write a test deploy script,i was tryed all ways that i can considered.but it did not work, if have spare time.

this is clue of my test.

in this image is:

• the runner can reach target machine
• whoami is runner
• ls .ssh dir it's shows runner have rights of know_hosts and private key file,but use cat (ls /pathTo/.ssh) it shows permission denied,it's wired

i doubt the private key did work well,so i copy key in to a ubuntu container(runner also running under a contaienr),then trying same command to connect target host.

the key configuration is works for test container and this is the permission of test file and ownership，in this working case cat ls was readout the file content

the deploy script is

          - name: Echo user
            run: echo ${{ vars.REMOTE_USER }} && ping -c 2 -W 3 ${{ vars.REMOTE_HOST }}
          - name: Deploy
            uses: easingthemes/ssh-deploy@main
            with:
              SSH_PRIVATE_KEY: ${{ secrets.SSH_PRIVATE_KEY }}
              ARGS: "-rlgoDzvc -i --delete"
              REMOTE_HOST: ${{ vars.REMOTE_HOST }}
              REMOTE_USER: ${{ vars.REMOTE_USER }}
              TARGET: ${{ vars.REMOTE_TARGET }}
              SOURCE: "src/"
              EXCLUDE: "/dist/, /node_modules/"
              SCRIPT_BEFORE: |
                  whoami
                  ls -al
              # SCRIPT_AFTER: |
              #     whoami
              #     ls -al
              #     echo "done!"
          - name: look perm
            run: whoami && ls -la /home/runner/.ssh  && cat $(ls /home/runner/.ssh)

where i am wrong.