Add test job to release CI: Zig build + tests gate the release

Runs zig build, zig build test, and mix test before NIF builds start.
Release only created if all tests and all NIF builds pass.

Author: bcardarella

.github/workflows/release.yml

@@ -9,8 +9,41 @@ permissions:
   contents: write
 
 jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Zig
+        uses: mlugg/setup-zig@v2
+        with:
+          version: 0.15.2
+
+      - name: Build Zig library
+        run: zig build -Doptimize=ReleaseFast
+
+      - name: Run Zig tests
+        run: zig build test
+
+      - name: Set up Erlang/Elixir
+        uses: erlef/setup-beam@v1
+        with:
+          otp-version: "27"
+          elixir-version: "1.17"
+
+      - name: Run Elixir tests
+        env:
+          TAILWIND_COMPILER_PATH: "true"
+        run: |
+          mix local.hex --force
+          mix local.rebar --force
+          mix deps.get
+          mix test
+
   build_nif:
     name: Build NIF (${{ matrix.target }})
+    needs: test
     runs-on: ${{ matrix.runner }}
     strategy:
       fail-fast: true
@@ -101,7 +134,7 @@ jobs:
 
   release:
     name: Create Release
-    needs: build_nif
+    needs: [test, build_nif]
     runs-on: ubuntu-latest
     steps:
       - name: Download all artifacts