Let ansible copy existing ssh key over to robot (UBC-Thunderbots#3490)

* changes

* Willima nit

* new task for copying ssh key

* add task to relevant files

* [pre-commit.ci lite] apply automatic fixes

* Renaming stuff

* Renaming stuff

* bugfix for precommit

---------

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: williamckha <williamha@outlook.com>

Author: 3 people

src/software/embedded/ansible/playbooks/deploy_powerboard.yml

@@ -3,6 +3,9 @@
   hosts: THUNDERBOTS_HOSTS
 
   tasks:
+    - name: Copy SSH public key
+      ansible.builtin.import_tasks: ../tasks/copy_ssh_key.yml
+
     - name: Sync powerboard files
       become: true
       become_method: ansible.builtin.sudo

src/software/embedded/ansible/playbooks/deploy_robot_software.yml

@@ -14,6 +14,9 @@
       robot_diagnostics_cli_tar: ../../robot_diagnostics_cli/robot_diagnostics_cli_tar.tar.gz
 
   tasks:
+    - name: Copy SSH public key
+      ansible.builtin.import_tasks: ../tasks/copy_ssh_key.yml
+
     - name: Log Robot ID
       ansible.builtin.debug:
         msg: "[Robot ID = {{ inventory_hostname }}]"

src/software/embedded/ansible/playbooks/setup_nano.yml

@@ -3,6 +3,8 @@
   hosts: THUNDERBOTS_HOSTS
 
   tasks:
+    - name: Copy SSH public key
+      ansible.builtin.import_tasks: ../tasks/copy_ssh_key.yml
     - name: Check internet connection
       tags: dependencies
       ansible.builtin.import_tasks: ../tasks/check_internet.yml

src/software/embedded/ansible/playbooks/setup_pi.yml

@@ -3,6 +3,9 @@
   hosts: THUNDERBOTS_HOSTS
 
   tasks:
+    - name: Copy SSH public key
+      ansible.builtin.import_tasks: ../tasks/copy_ssh_key.yml
+
     - name: Check internet connection
       tags: dependencies
       ansible.builtin.import_tasks:

src/software/embedded/ansible/tasks/copy_ssh_key.yml

@@ -0,0 +1,18 @@
+---
+- name: Copy SSH public key
+  block:
+    - name: Find SSH public key
+      ansible.builtin.stat:
+        path: ~/.ssh/id_ed25519.pub
+      register: ssh_key_file
+
+    - name: Tell user to make key
+      ansible.builtin.debug:
+        msg: "Please create an ed25519 SSH key using ssh-keygen"
+      when: not ssh_key_file.stat
+
+    - name: Copy SSH public key to robot
+      ansible.posix.authorized_key:
+        user: robot
+        key: "{{ lookup('file', '~/.ssh/id_ed25519.pub') }}"
+      when: ssh_key_file.stat