add k3s roles

linux/k3s/master/defaults/main.yml

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+k3s_token: SOME_SECRET
+k3s_bootstrap: false

linux/k3s/master/tasks/main.yml

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+- name: run cluster init on first node
+  shell: "curl -sfL https://get.k3s.io | K3S_TOKEN={{ k3s_secret }}" sh -s - server --cluster-init"
+  become: yes
+  when: k3s_bootstrap

linux/k3s/nodes/defaults/main.yml

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+k3s_token: "{{ k3s_token }}"
+k3s_bootstrap: false

linux/k3s/nodes/tasks/main.yml

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+- name: join node to cluster
+  shell: "curl -sfL https://get.k3s.io | K3S_TOKEN={{ k3s_token }} sh -s - server --server https://{{ k3s_master_address }}>:6443"
+  become: yes
+  when: k3s_bootstrap