workflow: re-enable github action workflows for kernel builds

also updated the nix version used in the workflow

.github/workflows/cachix.yml

@@ -1,6 +1,7 @@
 name: Cachix build
 
 on:
+  push:
   workflow_dispatch:
 
 jobs:
@@ -11,24 +12,10 @@ jobs:
       - uses: actions/checkout@v2.3.4
       - uses: cachix/install-nix-action@v13
         with:
-          install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20201007_5257a25/install
+          install_url: https://github.com/numtide/nix-unstable-installer/releases/download/nix-2.5pre20211026_5667822/install
           extra_nix_config: experimental-features = nix-command flakes
       - uses: cachix/cachix-action@v10
         with:
           name: lava
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
       - run: nix build -L .#linux-lava
-  wine:
-    name: Build Wine
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2.3.4
-      - uses: cachix/install-nix-action@v13
-        with:
-          install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20201007_5257a25/install
-          extra_nix_config: experimental-features = nix-command flakes
-      - uses: cachix/cachix-action@v10
-        with:
-          name: lava
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-      - run: nix build -L .#wine-osu