Fix oh-my-zsh and starship

- Install oh-my-zsh only if not present
- Install starship as unattended

Signed-off-by: Matej Focko <me@mfocko.xyz>

playbooks/roles/shell/tasks/zsh.yml

@@ -1,6 +1,12 @@
 ---
+- name: Check for oh-my-zsh
+  stat:
+    path: ~/.oh-my-zsh
+  register: ohmyzsh_directory
+
 - name: Install oh-my-zsh
   shell: sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)" "" --unattended
+  when: not ohmyzsh_directory.stat.exists
 
 - name: Clone zsh-autosuggestions
   git:
@@ -13,7 +19,7 @@
     dest: ~/.oh-my-zsh/custom/plugins/zsh-syntax-highlighting
 
 - name: Clone starship
-  shell: curl -fsSL https://starship.rs/install.sh | bash
+  shell: sh -c "$(curl -fsSL https://starship.rs/install.sh)" "" -f
 
 - name: Create zshrc
   template: