add wsl ssh agent setup

dot_bashrc.d/wsl-ssh-agent.sh.tmpl

@@ -0,0 +1,11 @@
+{{- if (eq .chezmoi.os "linux") -}}
+{{- if (contains "microsoft" .chezmoi.kernel.osrelease) -}}
+if [ -z "$(pgrep ssh-agent)" ]; then
+   rm -rf /tmp/ssh-*
+   eval $(ssh-agent -s) > /dev/null
+else
+   export SSH_AGENT_PID=$(pgrep ssh-agent)
+   export SSH_AUTH_SOCK=$(find /tmp/ssh-* -name agent.*)
+fi
+{{- end -}}
+{{- end -}}