Add github actions to build qmlls binaries

Add a github action to build a static release build of qmlls.
There should be nightly releases that are build at night on monday,
wednesday and friday (frequency to be adjusted in the future), and
"real" releases that are built when a tag is pushed.

There is also the option to trigger the workflow "by hand" to get
nightly builds.

Nightly qmlls is versioned via qtdeclarative's short SHA,
qmlls-nightly-<short sha>, and "real releases" just follow the tag name
(as long as they have 'qmlls' and not 'nightly' in their tag name).

Add some workaround for the file stripping to have debug information in
a file separate to the qmlls binary.

You can see the github action in action at
https://github.com/samishalayel/qt5/actions/workflows/build_qmlls.yaml

Task-number: QTBUG-126405
Change-Id: I5379215062d7424544663c1519c4e296baf11fba
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

.github/workflows/build_qmlls.yaml

@@ -0,0 +1,180 @@
+name: Build qmlls
+
+on:
+  # release nightly on schedule
+  schedule:
+    - cron: '0 2 * * 1,3,5'
+  # also release nightly on manual trigger
+  workflow_dispatch:
+  # release "real" release when a qmlls tag is pushed to dev
+  push:
+    branches:
+      - 'dev'
+    tags:
+      - 'qmlls-*'
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: ubuntu
+            os:   ubuntu-latest
+            deps: libgl-dev libglu-dev 'libxcb*-dev' libx11-xcb-dev libxkbcommon-x11-dev libb2-dev libdouble-conversion-dev
+            tools: ccache
+            install_cmd: sudo apt-get -y install
+            configure_flags: -xcb
+          - name: macos
+            os:   macos-latest
+            deps:
+            tools: ccache
+            install_cmd: HOMEBREW_NO_INSTALL_CLEANUP=1 brew install
+          - name: windows
+            os:   windows-latest
+            install_cmd: choco install
+            install_cmd_postfix: --yes --no-progress
+            tools: ccache
+            configure_flags: -no-feature-sql-psql -no-feature-sql-mysql -no-feature-sql-odbc
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - uses: lukka/get-cmake@latest
+
+    - name: prepare Linux
+      if: runner.os == 'Linux'
+      run: |
+        sudo apt-get update
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 100
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-10 100
+    - name: prepare macOS
+      if: runner.os == 'macOS'
+      run: echo noop
+    - name: prepare Windows
+      if: runner.os == 'Windows'
+      shell: cmd
+      run: |
+        call "C:/Program Files/Microsoft Visual Studio/2022/Enterprise/VC/Auxiliary/Build/vcvars64.bat"
+        set >> "%GITHUB_ENV%"
+
+    - uses: actions/checkout@v4
+      with:
+        path: source
+
+    - name: restore ccache
+      uses: actions/cache@v4
+      with:
+        path: ${{ runner.temp }}/ccache
+        key:  ccache-${{ matrix.os }}
+
+    - name: install build dependencies
+      run:  ${{ matrix.install_cmd }}  ${{ matrix.deps }}  ${{ matrix.install_cmd_postfix }}
+      if: matrix.deps != ''
+    - name: install compiler tools
+      run:  ${{ matrix.install_cmd }}  ${{ matrix.tools }}  ${{ matrix.install_cmd_postfix }}
+    - name: configure ccache
+      run: |
+        ccache --set-config sloppiness=file_macro,time_macros
+        ccache --set-config cache_dir='${{ runner.temp }}'/ccache
+        ccache --set-config compression=true
+        ccache --set-config max_size=1G
+
+    - name: initialize subrepositories
+      working-directory: source
+      run:  ./init-repository --module-subset=qtdeclarative --mirror="https://code.qt.io/qt/"
+
+    - name: set qtdeclarative to dev and set dependencies via dependencies.yaml
+      working-directory: source
+      run: cmake -DSYNC_TO_MODULE="qtdeclarative" -DSYNC_TO_BRANCH="dev" -P cmake/QtSynchronizeRepo.cmake
+
+    - name: configure and build
+      run:  |
+        mkdir build
+        cd build
+        ../source/configure -force-debug-info -ccache -no-pch -release -static \
+          -force-bundled-libs -submodules qtdeclarative -nomake tests -nomake examples \
+          -prefix '${{ runner.temp }}'/install_dir ${{ matrix.configure_flags }}
+        ninja qmlls
+
+    - name: Get current SHA
+      id: vars
+      working-directory: source/qtdeclarative
+      run: echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+    - name: Create info file
+      run: |
+        echo -e "commit: ${{ steps.vars.outputs.sha_short }}\nbuild: $(date +"%Y-%m-%dT%H:%M:%SZ")" \
+        > info.txt
+
+    # workaround because -separate-debug-info is not supported in static builds
+    # note: msvc on windows separates the debug info, no need to strip by hand
+    - name: Stripping qmlls binary on linux
+      if: matrix.name == 'ubuntu'
+      run: |
+        objcopy --only-keep-debug ./build/qtbase/bin/qmlls ./build/qtbase/bin/qmlls.dbg
+        strip ./build/qtbase/bin/qmlls
+        objcopy --add-gnu-debuglink=./build/qtbase/bin/qmlls.dbg ./build/qtbase/bin/qmlls
+
+    - name: Stripping qmlls binary on mac
+      if: matrix.name == 'macos'
+      run: |
+        dsymutil ./build/qtbase/bin/qmlls -o ./build/qtbase/bin/qmlls.dSYM
+        strip ./build/qtbase/bin/qmlls
+
+    - name: Zip build files in archive
+      run: 7z a qmlls-${{ matrix.name }}-${{ steps.vars.outputs.sha_short }}.7z ./build/qtbase/bin/qmlls* info.txt
+
+    - name: Upload archive
+      uses: actions/upload-artifact@v4
+      with:
+        path: qmlls-${{ matrix.name }}-${{ steps.vars.outputs.sha_short }}.7z
+        name: qmlls-${{ matrix.name }}-${{ steps.vars.outputs.sha_short }}.7z
+
+  release:
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        repository: qt/qtdeclarative
+        path: source
+
+    - name: Get current SHA
+      id: vars
+      working-directory: source
+      run: echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+    - name: Download artifacts
+      id: downloaded_artifacts
+      uses: actions/download-artifact@v4
+      with:
+        path: release
+
+    - name: Create nightly release
+      if: ${{ ! contains(github.ref, 'tags/qmlls-') }}
+      uses: softprops/action-gh-release@v2
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        tag_name: qmlls-nightly-${{ steps.vars.outputs.sha_short }}
+        draft: false
+        prerelease: true
+        files: release/*/*.7z
+
+    - name: Create release
+      if: ${{ contains(github.ref, 'tags/qmlls-') && !contains(github.ref, 'nightly') }}
+      uses: softprops/action-gh-release@v2
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        # note: use default tag_name
+        draft: true
+        prerelease: false
+        files: release/*/*.7z