fix: use matterlabsrobot docker namespace

Signed-off-by: Harald Hoyer <[email protected]>

.github/workflows/nix.yml

@@ -55,16 +55,17 @@ jobs:
         with:
           extra_nix_config: |
             access-tokens = github.com=${{ github.token }}
+
+      # Cache any artifacts that aren't already cached at https://cache.nixos.org
+      - name: Enable magic Nix cache
+        uses: DeterminateSystems/magic-nix-cache-action@main
+
       - uses: cachix/cachix-action@v14
         continue-on-error: true
         with:
           name: nixsgx
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
-      # Cache any artifacts that aren't already cached at https://cache.nixos.org
-      - name: Enable magic Nix cache
-        uses: DeterminateSystems/magic-nix-cache-action@main
-
       - name: nix build
         run: nix run nixpkgs#nixci
 
@@ -82,5 +83,5 @@ jobs:
           export IMAGE_TAG=$(docker load < result | grep -Po 'Loaded image.*: \K.*')
           echo "Pushing image ${IMAGE_TAG} to Docker Hub"
           echo "IMAGE_TAG=${IMAGE_TAG}" >> $GITHUB_ENV
-          docker push "${IMAGE_TAG}"
-          docker push "${IMAGE_TAG%:*}:latest"
+          docker push matterlabsrobot/"${IMAGE_TAG}"
+          docker push matterlabsrobot/"${IMAGE_TAG%:*}:latest"