Be more explicit about gpg2 and...

 - Allow for configuration of gpg command
 - New variable:
   `rocket_chat_pgp_command`: gpg2 (default)
 - Can be absolute path or in $PATH

defaults/main.yml

@@ -16,6 +16,7 @@ rocket_chat_tarball_check_checksum: false
 rocket_Chat_tarball_check_pgp: true
 rocket_chat_tarball_fetch_timeout: 100
 rocket_chat_tarball_validate_remote_cert: true
+rocket_chat_pgp_command: gpg2
 rocket_chat_service_user: rocketchat
 rocket_chat_service_group: rocketchat
 rocket_chat_service_host: "{{ ansible_fqdn }}"

tasks/main.yml

@@ -140,9 +140,10 @@
   - name: Setup PGP for verifying the Rocket.Chat tarball
     block:
 
-    - name: Import RochetChat PGP Key from default keyservers
+    - name: "Import RochetChat PGP Key from keyserver: {{ rocket_chat_tarball_gpg_keyserver }}"
       shell: |
-        gpg --keyserver "{{ rocket_chat_tarball_gpg_keyserver }}" \
+        {{ rocket_chat_pgp_command }} \
+            --keyserver "{{ rocket_chat_tarball_gpg_keyserver }}" \
             --recv-keys "{{ rocket_chat_tarball_gpg_key }}"
       register: add_key
       changed_when: "'not changed' not in add_key.stderr"
@@ -183,8 +184,9 @@
 
   - name: Verify Rocket.Chat binary tarball with GPG
     shell: |
-      gpg --verify rocket.chat-{{ rocket_chat_version }}.asc \
-                   rocket.chat-{{ rocket_chat_version }}.tgz
+      {{ rocket_chat_pgp_command }} \
+        --verify rocket.chat-{{ rocket_chat_version }}.asc \
+                 rocket.chat-{{ rocket_chat_version }}.tgz
     args:
       chdir: "{{ rocket_chat_application_path }}"
     when: rocket_Chat_tarball_check_pgp