run on nix runner

.gitea/workflows/build-and-publish.yaml

@@ -8,7 +8,7 @@ env:
   IMAGE_NAME: ${{ github.event.repository.name }}
 jobs:
   build-release:
-    runs-on: ubuntu-latest
+    runs-on: nix
     permissions:
       id-token: write
       contents: read
@@ -16,22 +16,13 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - uses: DeterminateSystems/determinate-nix-action@v3
-
       - uses: DeterminateSystems/flake-checker-action@main
         with:
           flake-lock-path: ./flake.lock
 
-      - name: Setup Attic cache
-        uses: ryanccn/attic-action@v0
-        with:
-          endpoint: ${{ secrets.ATTIC_ENDPOINT }}
-          cache: ${{ secrets.ATTIC_CACHE }}
-          token: ${{ secrets.ATTIC_TOKEN }}
-
       - name: Build Docker Image via Nix Flake
         run: |
-          NIX_BUILD_CORES=2 nix build .#dockerImage --max-jobs 2 --print-build-logs
+          nix build .#dockerImage -print-build-logs
           docker load < result
 
       - name: Push closure to Attic cache