Fix github environment variable set

Author: ArwynFr

action.yml

@@ -40,8 +40,8 @@ runs:
       run: |
         if [ -z "$SSH_AGENT_PID" ]; then
           eval $(ssh-agent)
-          echo "::set-env name=SSH_AUTH_SOCK::$SSH_AUTH_SOCK"
-          echo "::set-env name=SSH_AGENT_PID::$SSH_AGENT_PID"
+          echo "SSH_AUTH_SOCK=$SSH_AUTH_SOCK" >> $GITHUB_ENV
+          echo "SSH_AGENT_PID=SSH_AGENT_PID" >> $GITHUB_ENV          
         fi        
 
     - shell: bash