ci: use pipefail to expose cmake configure/build errors

Without set -o pipefail, cmake failures in piped commands are masked.
This ensures the step fails properly if cmake configure or build fails.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: zccrs

.github/workflows/dtkdeclarative-archlinux-build.yml

@@ -61,6 +61,7 @@ jobs:
 
       - name: Configure and build dtkdeclarative
         run: |
+          set -o pipefail
           cmake -B build \
             -GNinja \
             -DCMAKE_INSTALL_PREFIX=/usr \
@@ -71,12 +72,15 @@ jobs:
             -DBUILD_DOCS=OFF \
             -DBUILD_EXAMPLES=OFF \
             -DBUILD_TESTING=OFF \
-            -DDTK5=${{ matrix.dtk5 }} 2>&1 | tee /tmp/cmake-configure.log || { echo "=== CMAKE CONFIGURE FAILED ==="; cat /tmp/cmake-configure.log; exit 1; }
-          cmake --build build -j$(nproc) 2>&1 | tee /tmp/cmake-build.log || { echo "=== CMAKE BUILD FAILED (last 200 lines) ==="; tail -200 /tmp/cmake-build.log; exit 1; }
+            -DDTK5=${{ matrix.dtk5 }} 2>&1 | tee /tmp/cmake-configure.log
+          cmake --build build -j$(nproc) 2>&1 | tee /tmp/cmake-build.log
           echo "✅ dtkdeclarative Qt${{ matrix.qt_version }} built successfully!"
+          echo "=== Built files ==="
+          find build -name "*.so" -o -name "*.a" | head -20
 
       - name: Install dtkdeclarative to staging directory
         run: |
+          cat build/cmake_install.cmake 2>/dev/null | head -30 || true
           DESTDIR=/tmp/dtkdeclarative-install cmake --install build --verbose
           echo "Total: $(find /tmp/dtkdeclarative-install -type f | wc -l) files"
           find /tmp/dtkdeclarative-install -type f | head -20