add gnupg (see also https://stackoverflow.com/questions/50012232/erro…

…r-ansible-when-use-docker-role)

Signed-off-by: Masaya Kataoka <[email protected]>

.github/workflows/ansible.yaml

@@ -62,7 +62,7 @@ jobs:
     - name: basic install
       run: |
           apt-get update &&
-          apt-get install -y ansible git
+          apt-get install -y ansible git gnupg
     - name: run ansible and install docker
       run: |
           ansible-galaxy install -fr ansible/roles/requirements.yml