Add SSH and commit signing docs

docs/docs/firmware/dev-setup.md

@@ -7,6 +7,93 @@ Follow these steps to begin developing in `racecar/firmware`.
 
         echo "Copy Me --->"
 
+## Create an SSH Key
+
+=== "Windows"
+
+    In an admin PowerShell terminal, enter the following command:
+
+    ```text
+    ssh-keygen -t ed25519 -C "[email protected]"
+    ```
+
+    Save to the default location `c:/Users/YOU/.ssh/id_ed25519` and do not enter a passphrase. This will allow you to use the key without entering a password every time you push to GitHub.
+
+    Continue with the following commands:
+
+    ```text
+    type c:/Users/YOU/.ssh/id_ed25519 | clip
+    Get-Service -Name ssh-agent | Set-Service -StartupType Manual
+    Start-Service ssh-agent
+    ssh-add c:/Users/YOU/.ssh/id_ed25519
+    ```
+
+=== "Linux/Mac"
+
+    In a terminal window, enter the following command:
+
+    ```text
+    ssh-keygen -t ed25519 -C "[email protected]"
+    ```
+
+    Save to the default location `~/.ssh/id_ed25519` and do not enter a passphrase. This will allow you to use the key without entering a password every time you push to GitHub.
+
+    Continue with the following commands:
+
+    ```text
+    pbcopy < ~/.ssh/id_ed25519.pub
+    eval "$(ssh-agent -s)"
+    ssh-add ~/.ssh/id_ed25519
+    ```
+
+To add the key to your GitHub account, go to <https://github.com/settings/ssh/new>.
+
+- Name your key something descriptive.
+- Select "Authentication Key" as the key type.
+- Paste the contents of `id_ed25519.pub` into the "Key" box.
+- Click "Add SSH Key".
+
+Open another terminal to test your connection to GitHub by entering the following command:
+
+```text
+ssh -T [email protected]
+```
+
+Type "yes" when it asks if you want to continue connecting.
+You should see a message like "Hi username! You've successfully authenticated, but GitHub does not provide shell access."
+
+Additional GitHub documentation can be found [here](https://docs.github.com/en/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent) and [here](https://docs.github.com/en/authentication/connecting-to-github-with-ssh/testing-your-ssh-connection).
+
+## Enable Commit Signing
+
+!!! warning
+    You must have a verified email address on GitHub to sign commits.
+
+To add a signing key to your GitHub account, go to <https://github.com/settings/ssh/new>.
+
+- Name your key something descriptive.
+- Select "Signing Key" as the key type.
+- Paste the contents of `id_ed25519.pub` into the "Key" box.
+- Click "Add SSH Key".
+
+Update your git configuration to automatically sign commits with your key:
+
+=== "Windows"
+    ```text
+    git config --global user.signingkey c:/Users/YOU/.ssh/id_ed25519
+    git config --global gpg.format=ssh
+    git config --global commit.gpgsign true
+    ```
+
+=== "Linux/Mac"
+    ```text
+    git config --global user.signingkey ~/.ssh/id_ed25519
+    git config --global gpg.format=ssh
+    git config --global commit.gpgsign true
+    ```
+
+Additional GitHub documentation can be found [here](https://docs.github.com/en/authentication/managing-commit-signature-verification/telling-git-about-your-signing-key).
+
 ## Dependencies
 
 === "Windows"