Login GitHub Actions VM with SSH using Tailscale

tailscale.yml

name: Setup Tailscale on GitHub Actions

on: [push]

jobs:
  tailscale:
    runs-on: ubuntu-20.04
    steps:
      - run: |
          curl -fsSL https://pkgs.tailscale.com/stable/ubuntu/focal.gpg | sudo apt-key add -
          curl -fsSL https://pkgs.tailscale.com/stable/ubuntu/focal.list | sudo tee /etc/apt/sources.list.d/tailscale.list
      - run: |
          sudo apt-get update
          sudo apt-get install tailscale

      - run: |
          mkdir ~/.ssh
          touch ~/.ssh/authorized_keys
          echo "$SSH_PUBKEY" >> ~/.ssh/authorized_keys
          chmod 755 ~
          chmod 700 ~/.ssh
          chmod 600 ~/.ssh/authorized_keys
        env:
          SSH_PUBKEY: ${{ secrets.SSH_PUBKEY }}
       
      - run: |
          echo "Setting up tailscale ..."
          sudo tailscale up
          echo -n "Done"

      # Assume that `tailscale status` shows local IP in the first line of outputs
      - run: |
          HOST=`sudo tailscale status | head -n1 | tr -s ' ' | cut -d ' ' -f 1`
          echo "ssh -i /path/to/your_key `whoami`@$HOST"
          
      # If you have troubles with ssh, try watching auth.log
      # - run: tail -f /var/log/auth.log

      - run: |
          sleep 300