Switch to nix-community nix cache action (#9)

Author: SuperSandro2000

.github/workflows/deadnix.yaml

@@ -15,7 +15,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v31
+
+      - name: Install Nix
+        uses: nixbuild/nix-quick-install-action@v30
+
+      - uses: nix-community/cache-nix-action@v6
+        with:
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-
+
       - uses: astro/deadnix-action@main
         with:
           flags: "-l"

.github/workflows/flake-check.yaml

@@ -15,5 +15,13 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: cachix/install-nix-action@v31
+
+      - name: Install Nix
+        uses: nixbuild/nix-quick-install-action@v30
+
+      - uses: nix-community/cache-nix-action@v6
+        with:
+          primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/flake.lock') }}
+          restore-prefixes-first-match: nix-${{ runner.os }}-
+
       - run: nix flake check