Fix missing earthly install

Signed-off-by: Itxaka <itxaka@kairos.io>

Author: Itxaka

.github/workflows/reusable-docker-arm-build.yaml

@@ -91,10 +91,9 @@ jobs:
       - name: Install Cosign
         uses: sigstore/cosign-installer@main
       - name: Install earthly
-        uses: Luet-lab/luet-install-action@cec77490c3f2416d7d07a47cfab04d448641d7ce # v1.1
+        uses: earthly/actions-setup@v1
         with:
-          repository: quay.io/kairos/packages
-          packages: utils/earthly
+          github-token: ${{ secrets.GITHUB_TOKEN }}
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@master