Build and upload uki artifact on Release

Signed-off-by: Itxaka <itxaka.garcia@spectrocloud.com>

.github/workflows/release.yaml

@@ -157,6 +157,27 @@ jobs:
         with:
           sarif_file: 'sarif'
           category: ${{ matrix.flavor }}
+  build-uki:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+          git fetch --prune --unshallow
+      - name: Install earthly
+        uses: Luet-lab/luet-install-action@v1
+        with:
+          repository: quay.io/kairos/packages
+          packages: utils/earthly
+      - name: Build uki image 🔧
+        run: |
+          # Do fedora as its the smaller uki possible
+          earthly +uki --FLAVOR=fedora
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: |
+            build/efi
 # build-vm-images:
 #   needs: build
 #   runs-on: macos-12