use buildah for build

.gitea/workflows/deploy.yaml

@@ -18,15 +18,20 @@ jobs:
         uses: actions/checkout@v4
 
       # ── Build container image (includes WASM build stage) and push ──
+      - name: Configure insecure registry
+        run: |
+          mkdir -p /etc/containers
+          printf '[[registry]]\nlocation = "git.kimchi"\ninsecure = true\n' > /etc/containers/registries.conf
+
       - name: Build and push container image
         run: |
           IMAGE_TAG="${{ env.IMAGE }}:sha-${GITHUB_SHA::8}"
           IMAGE_LATEST="${{ env.IMAGE }}:latest"
 
-          docker build -f Containerfile -t "$IMAGE_TAG" -t "$IMAGE_LATEST" .
-          docker login "${{ env.REGISTRY }}" -u "${{ secrets.REGISTRY_USER }}" -p "${{ secrets.REGISTRY_PASSWORD }}"
-          docker push "$IMAGE_TAG"
-          docker push "$IMAGE_LATEST"
+          buildah bud -f Containerfile -t "$IMAGE_TAG" -t "$IMAGE_LATEST" .
+          buildah login "${{ env.REGISTRY }}" -u "${{ secrets.REGISTRY_USER }}" -p "${{ secrets.REGISTRY_PASSWORD }}"
+          buildah push "$IMAGE_TAG"
+          buildah push "$IMAGE_LATEST"
 
           echo "IMAGE_TAG=$IMAGE_TAG" >> "$GITHUB_ENV"