Gems are not installing with user permissions

[SturmB]

I'm still pretty new to Ruby and Ansible, but I think I've got a halfway-decent grasp of the basics.

That said, I don't know what to do to get gems like colorls and lolcat to work. I've installed them using this role:

# vars.yml
ruby_install_gems:
  - colorls
  - lolcat
ruby_install_gems_user: "sturm"

However, when I SSH into the machine where this role was run, I cannot run colorls I cannot even run any gem installation:

 sturm@ansible-test  ~  colorls

 sturm@ansible-test  ~  gem which colorls
/home/sturm/.gem/ruby/2.5.0/gems/colorls-1.4.1/lib/colorls.rb

 sturm@ansible-test  ~  gem install colorls
ERROR:  While executing gem ... (Gem::FilePermissionError)
    You don't have write permissions for the /var/lib/gems/2.5.0 directory.

 sturm@ansible-test  ~ 

This is on a DigitalOcean freshly-created Ubuntu 18.04 droplet. It was even created with Ansible. If it helps, here's the playbook containing tasks for after the provisioning of the droplet:

---
# digitalocean.yml
- hosts: do
  remote_user: root
  gather_facts: false

  vars_files:
    - vars.yml

  pre_tasks:
    - name: Wait for port 22 to become available
      local_action: "wait_for port=22 host={{ inventory_hostname }}"
    
    - name: Gathering Facts
      setup:

  tasks:
    - name: Ensure user is created
      include_role:
        name: weareinteractive.users

    - name: Ensure git is installed
      import_role:
        name: geerlingguy.git

    - name: Ensure zsh and all plugins are installed
      include_role:
        name: viasite-ansible.zsh

    - name: Ensure Ruby and gems are installed
      include_role:
        name: geerlingguy.ruby

- hosts: do
  remote_user: "{{ users[0].username }}"
  gather_facts: false

  vars_files:
    - vars.yml

  tasks:
    - name: Ensure SSH key pair is created
      openssh_keypair:
        path: ~/.ssh/id_github
        state: present
        type: "ed25519"
        comment: "test@digitalocean"
      register: keys

    - name: Ensure SSH key is on GitHub
      github_key:
        name: "test@digitalocean"
        token: "{{ github_access_token }}"
        state: present
        pubkey: "{{ keys.public_key }}"

Please let me know if you need any more information.

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