Retry magic cache

.gitea/workflows/build-pi-img.yml

@@ -23,29 +23,14 @@ jobs:
       - name: Remove access_tokens
         run: sed -i '/^access-tokens/d' /etc/nix/nix.conf
 
-      - name: Cache Nix store
-        uses: actions/cache@v3.3.1
-        id: nix-cache
-        with:
-          path: /tmp/nixcache
-          key: "pi-build-cache"
-
-      - name: "Import Nix store cache"
-        if: "steps.nix-cache.outputs.cache-hit == 'true'"
-        run: "nix-store --import < /tmp/nixcache"
-
-      - name: "Build application"
-        run: "nix build --print-build-logs"
+      - name: Nix Magic Cache
+        uses: https://github.com/DeterminateSystems/magic-nix-cache-action@main
 
       - name: Build image
         run: nix-build '<nixpkgs/nixos>' -A config.system.build.sdImage -I nixos-config=./pi-imgs/pi-initial.nix --argstr system aarch64-linux
-        
-      - name: Upload img file
-        uses: https://github.com/actions/upload-artifact@v3.1.2
+
+      - uses: https://github.com/actions/upload-artifact@v3.1.2
         with:
+          name: nixos-pi-23.05-{{ env.GITHUB_SHA }}.img
           path: result/sd-image/*.img
 
-      - name: "Export Nix store cache"
-        if: "steps.nix-cache.outputs.cache-hit != 'true'"
-        run: "nix-store --export $(find /nix/store -maxdepth 1 -name '*-*') > /tmp/nixcache"
-