Update linux-builds.yml

.github/workflows/linux-builds.yml

@@ -24,18 +24,36 @@ jobs:
       
   build_ubuntu_2204:
     runs-on: ubuntu-22.04
-    
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
+    - name: Cache Qt
+      id: cache-qt-6-4
+      uses: actions/cache@v1  # not v2!
+      with:
+        path: ../Qt/6.4.2
+        key: ${{ runner.os }}-QtCache-Qt6-4
+
     - name: Install Qt
       uses: jurplel/install-qt-action@v2
       with:
-          version:      6.2.*
+        version: 6.4.2
         host: linux
         target: desktop
-          archives: qtbase qtsvg
+        install-deps: true
+        cached: ${{ steps.cache-qt-6-4.outputs.cache-hit }}
         setup-python: false
+        tools: ''
+        tools-only: false
+
+    - name: Install needed xkbcommon symlink
+      run: sudo apt-get install libxkbcommon-dev -y    
+
+    - name: Ubuntu and Qt version
+      run: |
+        cat /etc/issue
+        echo number of processors: $(nproc)
+        qmake -v
     - name: qmake
       run: qmake
     - name: make
-      run: make -j4
+      run: make -j$(nproc)