install singularity

install singularity as a `common` package. This will resolve issue #299

Signed-off-by: John Lockman <jlockman3@gmail.com>

roles/common/vars/main.yml

@@ -26,6 +26,7 @@ common_packages:
   - docker-ce-cli-20.10.2
   - docker-ce-20.10.2
   - openssl
+  - singularity
 
 docker_packages:
   - docker-ce-cli-20.10.2
@@ -77,4 +78,4 @@ daemon_file_dest: /etc/docker/
 daemon_file_mode: 0644
 
 hosts_file_dest: "/etc/hosts"
-hosts_file_mode: "0644"
+hosts_file_mode: "0644"