use cachix instead of determinate systems

Author: kiriwalawren

.github/workflows/ci.yml

@@ -15,9 +15,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: DeterminateSystems/nix-installer-action@main
+      - name: Install Nix
+        uses: cachix/install-nix-action@v31
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
 
-      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Setup Cachix
+        uses: cachix/cachix-action@v16
+        with:
+          name: kiriwalawren
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: Find Checks 🔍
         id: checks
@@ -36,9 +43,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: DeterminateSystems/nix-installer-action@main
+      - name: Install Nix
+        uses: cachix/install-nix-action@v31
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
 
-      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Setup Cachix
+        uses: cachix/cachix-action@v16
+        with:
+          name: kiriwalawren
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       # Enable KVM for VM tests
       - name: Enable KVM group perms

.github/workflows/update-flake.yml

@@ -12,9 +12,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: DeterminateSystems/nix-installer-action@main
+      - name: Install Nix
+        uses: cachix/install-nix-action@v31
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
 
-      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: Setup Cachix
+        uses: cachix/cachix-action@v16
+        with:
+          name: kiriwalawren
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
       - name: Update flake.lock
         run: nix flake update