feat: Allow use of akmods module (#71)

The akmods module require having the /rpms directory put into /tmp/rpms.
By default we will mount the akmods image with the `main-{{ os_version
}}` tag.

If a user supplies `base` for the akmods module in their recipe, it will
pull that image tag instead and mount the resulting /rpms.

```yaml
modules:
- type: akmods
  base: surface
  install:
  - openrazer
```

This would pull the image `ghcr.io/ublue-os/akmods:surface-39`.

A user can also supply `nvidia-version` with the numerical version of
the driver you would like to use. Doing so will mount the appropriate
`akmods-nvidia` image with the version of the driver you want in the
tag.

```yaml
modules:
- type: akmods
  nvidia-version: 545
  install:
  - nvidia
```

This would pull the image `ghcr.io/ublue-os/akmods-nvidia:main-39-545`
and `ghcr.io/ublue-os/akmods:main-39`.

This uses bind mount like all the other modules so these files will not
persist into the final image.

integration-tests/test-repo/config/recipe.yml

@@ -4,12 +4,21 @@ name: template
 description: This is my personal OS image.
 
 # the base image to build on top of (FROM) and the version tag to use
-base-image: ghcr.io/ublue-os/silverblue-main
+base-image: ghcr.io/ublue-os/silverblue-surface
 image-version: 39 # latest is also supported if you want new updates ASAP
 
 # module configuration, executed in order
 # you can include multiple instances of the same module
 modules:
+  - type: akmods
+    base: surface
+    nvidia-version: 545
+    install:
+      - nvidia
+      - openrazer
+  - type: akmods
+    install:
+      - openrgb
   - type: files
     files:
       - usr: /usr # copies config/files/usr into your image's /usr.