change into zsh for asdf

roles/asdf/tasks/main.yml

@@ -26,9 +26,10 @@
       - libncurses-dev
       - openjdk-11-jdk
 - name: Install asdf Erlang plugin
-  shell: zsh asdf plugin add erlang https://github.com/asdf-vm/asdf-erlang.git
-  args:
+  shell:
+    cmd: asdf plugin add erlang https://github.com/asdf-vm/asdf-erlang.git
     creates: ~/.asdf/plugins/erlang
+    executable: /usr/bin/zsh
 - name: Install Elixir prerequisite APT packages
   become: true
   apt:
@@ -38,6 +39,7 @@
     pkg:
       - unzip
 - name: Install asdf Elixir plugin
-  shell: zsh asdf plugin-add elixir https://github.com/asdf-vm/asdf-elixir.git
-  args:
+  shell:
+    cmd: asdf plugin-add elixir https://github.com/asdf-vm/asdf-elixir.git
     creates: ~/.asdf/plugins/elixir
+    executable: /usr/bin/zsh