Add CI to build wasm

.github/workflows/wasm.yml

@@ -0,0 +1,46 @@
+name: wasm
+
+on:
+  push:
+  #schedule:
+  #  - cron: '*/120 8-18 * * *'  # every 2 hours from 8:00 to 18:00 every day
+
+jobs:
+  build: # the first job
+    # current job matrix. if modified, remember to UPDATE the strategy in the next job
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-22.04]
+
+    runs-on: ${{ matrix.os }}
+
+    timeout-minutes: 30
+
+    steps: # job steps
+      - name: Check-out repository
+        uses: actions/checkout@v4
+
+      - name: Install emsdk
+        if: False
+        shell: bash
+        run: |
+          git clone https://github.com/emscripten-core/emsdk.git
+          cd emsdk
+          git pull
+          ./emsdk install 3.1.50		# this version is needed for Qt 6.7
+          ./emsdk activate 3.1.50
+
+      - name: Install Qt for WebAssembly
+        shell: bash
+        run: |
+          curl -L -O https://download.qt.io/official_releases/online_installers/qt-unified-linux-arm64-online.run
+          ls -l
+          chmod u+x qt-unified-linux-arm64-online.run
+          ./qt-unified-linux-arm64-online.run \
+          --root /home/runner/Qt \
+          --accept-licenses \
+          --accept-obligations \
+          --default-answer \
+          --confirm-command \
+          install qt.qt6.672.wasm_singlethread qt.qt6.672.qt5compat