docs and a compose file for docker compose builds

sets up an alternative docker-based build environment for people not
using vscode

docker-compose.yml

@@ -0,0 +1,21 @@
+---
+version: "3.9"
+services:
+    shell:
+        ports:
+            - 3000
+        build:
+            context: .devcontainer/
+            dockerfile: Dockerfile
+        volumes:
+            - $PWD:/workspace
+            - zmk-root-user:/root
+            - zmk-zephyr:/workspace/zephyr
+            - zmk-zephyr-modules:/workspace/modules
+            - zmk-zephyr-tools:/workspace/tools
+
+volumes:
+    zmk-root-user:
+    zmk-zephyr:
+    zmk-zephyr-modules:
+    zmk-zephyr-tools:

docs/docs/development/build-flash.md

@@ -90,7 +90,11 @@ This produces `left` and `right` subfolders under the `build` directory and two
 
 ### Building from `zmk-config` Folder
 
-Instead of building .uf2 files using the default keymap and config files, you can build directly from your [`zmk-config` folder](../user-setup.md#github-repo) by adding
+Getting your `zmk-config` to be used by your build environment differs based on what type of build environment you are using.
+
+#### non-containerized environment
+
+Instead of building .uf2 files using the default keymap and config files, you can build directly from your [`zmk-config` folder](../user-setup#github-repo) by adding
 `-DZMK_CONFIG="C:/the/absolute/path/config"` to your `west build` command. **Notice that this path should point to the folder labelled `config` within your `zmk-config` folder.**
 
 For instance, building kyria firmware from a user `myUser`'s `zmk-config` folder on Windows 10 may look something like this:
@@ -99,6 +103,8 @@ For instance, building kyria firmware from a user `myUser`'s `zmk-config` folder
 west build -b nice_nano -- -DSHIELD=kyria_left -DZMK_CONFIG="C:/Users/myUser/Documents/Github/zmk-config/config"
 ```
 
+#### VSCode Remote Container environnment
+
 In order to make your `zmk-config` folder available when building within the VSCode Remote Container, you need to create a docker volume named `zmk-config`
 by binding it to the full path of your config directory. If you have run the VSCode Remote Container before, it is likely that docker has created this
 volume automatically -- we need to delete the default volume before binding it to the correct path. Follow the following steps:
@@ -116,6 +122,16 @@ docker volume create --driver local -o o=bind -o type=none -o \
 
 Now start VSCode and rebuild the container after being prompted. You should be able to see your zmk-config mounted to `/workspaces/zmk-config` inside the container. So you can build your custom firmware with `-DZMK_CONFIG="/workspaces/zmk-config/config"`.
 
+#### docker compose build environment
+
+Attaching your `zmk-config` to your docker-compose build environment is done by specifying a volume mount when running the service:
+
+```
+docker compose run --rm -v /full/path/to/your/zmk-config:/workspace/zmk-config shell bash
+```
+
+Now you can build your custom firmware with `-DZMK_CONFIG=/workspace/zmk-config/config".`
+
 ## Flashing
 
 The above build commands generate a UF2 file in `build/zephyr` (or

docs/docs/development/setup.md

@@ -16,6 +16,7 @@ values={[
 {label: 'Raspberry OS', value: 'raspberryos'},
 {label: 'Fedora', value: 'fedora'},
 {label: 'VS Code & Docker', value: 'docker'},
+{label: 'docker compose', value: 'dockercompose'},
 ]
 }>{props.children}</Tabs>);
 
@@ -195,7 +196,7 @@ This setup leverages the same [image which is used by the GitHub action](https:/
 3. Install the [Remote - Containers extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)
 
 :::info
-The docker container includes `west` and the compilation toolchain. If you're using docker and VS Code, you can skip right to [Source Code](#source-code).
+The docker container includes `west` and the compilation toolchain. If you're using docker and VS Code, or `docker compose`, you can skip right to [Source Code](#source-code).
 :::
 
 </TabItem>
@@ -421,6 +422,20 @@ All subsequent steps must be performed from the VS Code terminal _inside_ the co
 :::
 
 </TabItem>
+
+<TabItem value="dockercompose">
+
+Open a terminal and `cd` into your `zmk` repository.
+
+Run `docker compose up -d`.
+
+To enter the build environment container, run `docker compose run --rm shell bash`. The zmk repo will be mounted into the `/workspace` directory.
+
+:::caution
+All subsequent steps must be performed _inside_ the container.
+:::
+</TabItem>
+
 </OsTabs>
 
 #### Initialize West