ci: install zig via pantry action instead of mlugg/setup-zig

Replace the stale 0.17.0-dev.56 pin (below the 0.17.0-dev.956 floor the zig
toolchain needs) with pantry-pm/pantry/packages/action@main and a rolling
`zig@0.17.0-dev` spec, which resolves the current master from
ziglang.org/download/index.json and tracks upstream automatically.

Author: chrisbbreuer

.github/workflows/ci.yml

@@ -13,17 +13,17 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        zig-version: ['0.17.0-dev.56+a8226cd53']
+        zig-version: ['0.17.0-dev']
       fail-fast: false
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v6
 
       - name: Setup Zig
-        uses: mlugg/setup-zig@v2
+        uses: pantry-pm/pantry/packages/action@main
         with:
-          version: '0.17.0-dev.56+a8226cd53'
+          packages: zig@0.17.0-dev
 
       - name: Verify Zig installation
         run: zig version
@@ -46,9 +46,9 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Setup Zig
-        uses: mlugg/setup-zig@v2
+        uses: pantry-pm/pantry/packages/action@main
         with:
-          version: '0.17.0-dev.56+a8226cd53'
+          packages: zig@0.17.0-dev
 
       - name: Check formatting
         run: zig fmt --check .
@@ -62,9 +62,9 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Setup Zig
-        uses: mlugg/setup-zig@v2
+        uses: pantry-pm/pantry/packages/action@main
         with:
-          version: '0.17.0-dev.56+a8226cd53'
+          packages: zig@0.17.0-dev
 
       - name: Generate docs
         run: zig build-lib -femit-docs src/lib.zig
@@ -84,9 +84,9 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Setup Zig
-        uses: mlugg/setup-zig@v2
+        uses: pantry-pm/pantry/packages/action@main
         with:
-          version: '0.17.0-dev.56+a8226cd53'
+          packages: zig@0.17.0-dev
 
       - name: Install kcov
         continue-on-error: true