fix: optionally use a predefined Radicle node key

ansible/roles/radicle-ci-node/tasks/main.yml

@@ -96,7 +96,35 @@
       unxz --keep --force "$x.xz"
     fi
 
-- name: "set up Radicle node"
+- name: "create ~ci/.radicle/keys"
+  when: radicle_ci_node_key is defined
+  file:
+    state: directory
+    path: /home/ci/.radicle/keys
+    owner: ci
+    group: ci
+
+- name: "change Radicle node to use predefined key"
+  when: radicle_ci_node_key is defined
+  copy:
+    content: |
+      {{ radicle_ci_node_key }}
+    dest: /home/ci/.radicle/keys/radicle
+
+- name: "change Radicle node to use predefined public key"
+  when: radicle_ci_node_key_pub is defined
+  copy:
+    content: |
+      {{ radicle_ci_node_key_pub }}
+    dest: /home/ci/.radicle/keys/radicle.pub
+
+- name: "set up Radicle node configuration"
+  when: radicle_ci_node_key is defined
+  shell: |
+    sudo -i -u ci rad config init --alias "ci-{{ inventory_hostname }}"
+
+- name: "set up Radicle node with new key"
+  when: radicle_ci_node_key is undefined
   shell: |
     sudo -i -u ci rad auth --alias "ci-{{ inventory_hostname }}" --stdin </dev/null
 
@@ -128,3 +156,4 @@
   systemd:
     name: radicle-ci-broker
     state: restarted
+