CI: Build GUI on ubuntu (#2626)

.github/workflows/CI-unixish.yml

@@ -28,6 +28,12 @@ jobs:
         if: matrix.os == 'macos-latest'
         run: |
           brew install z3
+          
+      - name: Install Qt
+        if: matrix.os == 'ubuntu-latest'
+        uses: jurplel/install-qt-action@v2
+        with:
+          modules: 'qtcharts'
 
       - name: Build cppcheck
         run: |
@@ -37,7 +43,7 @@ jobs:
         run: |
           make -j2 testrunner USE_Z3=yes HAVE_RULES=yes
 
-      - name: Test
+      - name: Run test
         run: |
           make -j2 check USE_Z3=yes HAVE_RULES=yes
 
@@ -45,3 +51,10 @@ jobs:
         run: |
           make validateCFG
           make validatePlatforms
+          
+      - name: Build GUI on ubuntu
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          pushd gui
+          qmake HAVE_QCHART=yes
+          make -j2