action: Use docker image pull support

Replace the open-coded image pull and decompression with native OCI
image support directly in LVH.

Signed-off-by: Joe Stringer <[email protected]>

action.yaml

@@ -159,15 +159,7 @@ runs:
       if: ${{ inputs.provision == 'true' && steps.cache-lvh-image.outputs.cache-hit != 'true' }}
       shell: bash
       run: |
-        sudo mkdir /_images; sudo chmod 777 /_images
-        docker run -v /_images:/mnt/images quay.io/lvh-images/${{ inputs.image }}:${{ inputs.image-version }} cp /data/images/${{ steps.derive-image-name.outputs.image-name }}.qcow2.zst /mnt/images
-
-    - name: Prepare VM image
-      if: ${{ inputs.provision == 'true'  }}
-      shell: bash
-      run: |
-        cd /_images
-        zstd -d ${{ steps.derive-image-name.outputs.image-name }}.qcow2.zst -o ${{ inputs.test-name }}.qcow2
+        /bin/lvh images pull --cache quay.io/lvh-images/${{ inputs.image }}:${{ inputs.image-version }} -d "/"
 
     - name: Start VM
       if: ${{ inputs.provision == 'true' }}