ci: don't use nix for everything, only build and cache the devshell

Author: bandithedoge

.github/workflows/docs.yml

@@ -13,27 +13,11 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install Lix
-        uses: canidae-solutions/lix-quick-install-action@v3
-        with:
-          lix_conf: |
-            keep-env-derivations = true
-            keep-outputs = true
-
-      - name: Cache Nix store
-        uses: nix-community/cache-nix-action@v6
-        with:
-          primary-key: nix-${{ runner.os }}
-          gc-max-store-size: 5G
-
-      - name: Setup Nix cache
-        uses: cachix/cachix-action@v16
-        with:
-          name: zigplug
-          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - name: Setup Zig
+        uses: mlugg/setup-zig@v2
 
       - name: Build docs
-        run: nix develop -c zig build docs
+        run: zig build docs
 
       - name: Setup Pages
         uses: actions/configure-pages@v5

.github/workflows/examples.yml

@@ -10,28 +10,12 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Install Lix
-        uses: canidae-solutions/lix-quick-install-action@v3
-        with:
-          lix_conf: |
-            keep-env-derivations = true
-            keep-outputs = true
-
-      - name: Cache Nix store
-        uses: nix-community/cache-nix-action@v6
-        with:
-          primary-key: nix-${{ runner.os }}
-          gc-max-store-size: 5G
-
-      - name: Setup Nix cache
-        uses: cachix/cachix-action@v16
-        with:
-          name: zigplug
-          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+      - name: Setup Zig
+        uses: mlugg/setup-zig@v2
 
       - name: Build examples
         run: |
           for example in $(find $(realpath ..) -path "*/zigplug/examples/*/build.zig"); do
             cd $(dirname $example)
-            nix develop -c zig build
+            zig build
           done

.github/workflows/nix.yml

@@ -0,0 +1,35 @@
+on:
+  push:
+    paths: ["*.nix"]
+  pull_request:
+    paths: ["*.nix"]
+
+jobs:
+  nix:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Lix
+        uses: canidae-solutions/lix-quick-install-action@v3
+        with:
+          lix_conf: |
+            keep-env-derivations = true
+            keep-outputs = true
+
+      - name: Cache Nix store
+        uses: nix-community/cache-nix-action@v6
+        with:
+          primary-key: nix-${{ runner.os }}
+          gc-max-store-size: 5G
+
+      - name: Setup Nix cache
+        uses: cachix/cachix-action@v16
+        with:
+          name: zigplug
+          authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+      - name: Build devshell
+        run: nix build .#devShells.$(nix eval builtins.currentSystem --impure).default