ci: split configure/build steps for better error diagnosis

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

Author: zccrs

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

@@ -59,9 +59,8 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Configure and build dtkdeclarative
+      - name: Configure dtkdeclarative
         run: |
-          set -o pipefail
           cmake -B build \
             -GNinja \
             -DCMAKE_INSTALL_PREFIX=/usr \
@@ -73,18 +72,32 @@ jobs:
             -DBUILD_EXAMPLES=OFF \
             -DBUILD_TESTING=OFF \
             -DDTK5=${{ matrix.dtk5 }} 2>&1 | tee /tmp/cmake-configure.log
+          echo "✅ Configure done"
+
+      - name: Print configure log on failure
+        if: failure()
+        run: |
+          echo "=== cmake-configure.log (last 80 lines) ==="
+          tail -80 /tmp/cmake-configure.log 2>/dev/null || echo "(not found)"
+          tail -20 /tmp/cmake-configure.log 2>/dev/null | while IFS= read -r line; do
+            echo "::error::$line"
+          done
+
+      - name: Build dtkdeclarative
+        run: |
           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: Print build logs on failure
+      - name: Print build log on failure
         if: failure()
         run: |
-          echo "=== cmake-configure.log ==="
-          cat /tmp/cmake-configure.log 2>/dev/null || echo "(not found)"
           echo "=== cmake-build.log (last 100 lines) ==="
           tail -100 /tmp/cmake-build.log 2>/dev/null || echo "(not found)"
+          grep -E "error:|Error:|FAILED" /tmp/cmake-build.log 2>/dev/null | head -20 | while IFS= read -r line; do
+            echo "::error::$line"
+          done
 
       - name: Install dtkdeclarative to staging directory
         run: |