Revert "workflows: use Nix in CI."

This reverts commit 16a1152.

.github/workflows/spec.yml

@@ -10,8 +10,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: recursive
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v4
-      - name: Run the Magic Nix Cache
-        uses: DeterminateSystems/magic-nix-cache-action@v2
-      - run: nix build '.?submodules=1#specs' -L
+      - uses: goto-bus-stop/setup-zig@v1
+        with:
+          version: 0.11.0
+      - run: make spec

.github/workflows/zig.yml

@@ -5,20 +5,29 @@ on:
   pull_request:
 
 jobs:
-  test-nix:
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest]
-    runs-on: ${{ matrix.os }}
+  test-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - uses: goto-bus-stop/setup-zig@v1
+        with:
+          version: 0.11.0
+      - run: zig build
+      - run: zig build test
+  test-macos:
+    runs-on: macos-latest
     steps:
       - uses: actions/checkout@v3
         with:
           submodules: recursive
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v4
-      - name: Run the Magic Nix Cache
-        uses: DeterminateSystems/magic-nix-cache-action@v2
-      - run: nix build '.?submodules=1' -L
+      - uses: goto-bus-stop/setup-zig@v1
+        with:
+          version: 0.11.0
+      - run: brew install pcre
+      - run: zig build
+      - run: zig build test
   test-windows:
     runs-on: windows-latest
     steps:
@@ -39,8 +48,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           submodules: recursive
-      - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v4
-      - name: Run the Magic Nix Cache
-        uses: DeterminateSystems/magic-nix-cache-action@v2
-      - run: nix develop --command zig fmt --check src/*.zig
+      - uses: goto-bus-stop/setup-zig@v1
+        with:
+          version: 0.11.0
+      - run: zig fmt --check src/*.zig

.gitignore

@@ -1,3 +1,2 @@
 /zig-*
 koino.code-workspace
-/result*