ci(github): use setup-task with output grouping for tests

Restore the --output group options for better GitHub Actions log
grouping, while keeping the separate build job for compilation check.

.github/workflows/ci.yml

@@ -13,6 +13,25 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  build:
+    name: 🔨 Build (${{ matrix.go-version }})
+    strategy:
+      fail-fast: false
+      matrix:
+        go-version: [1.24.x, 1.25.x]
+    runs-on: ubuntu-latest
+    steps:
+      - name: 📥 Checkout
+        uses: actions/checkout@v6
+
+      - name: ⬇️ Setup Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: 🔨 Build
+        run: go build -v ./cmd/task
+
   test:
     name: 🧪 Test (${{ matrix.go-version }}, ${{ matrix.platform }})
     strategy:
@@ -30,11 +49,11 @@ jobs:
         with:
           go-version: ${{ matrix.go-version }}
 
-      - name: 🔨 Build
-        run: go build -v -o ./bin/task ./cmd/task
+      - name: ⬇️ Setup Task
+        uses: go-task/setup-task@v1
 
       - name: 🧪 Test
-        run: ./bin/task test
+        run: task test --output group --output-group-begin '::group::{{.TASK}}' --output-group-end '::endgroup::'
 
   lint:
     name: 🔍 Lint (${{ matrix.go-version }})
@@ -78,12 +97,13 @@ jobs:
   ci-status:
     name: ✅ CI
     runs-on: ubuntu-latest
-    needs: [test, lint, lint-jsonschema]
+    needs: [build, test, lint, lint-jsonschema]
     if: always()
     steps:
       - name: ✅ Check CI status
         run: |
-          if [[ "${{ needs.test.result }}" != "success" ]] || \
+          if [[ "${{ needs.build.result }}" != "success" ]] || \
+             [[ "${{ needs.test.result }}" != "success" ]] || \
              [[ "${{ needs.lint.result }}" != "success" ]] || \
              [[ "${{ needs.lint-jsonschema.result }}" != "success" ]]; then
             echo "CI failed"