CICD: Update Qt Version Used in the MacOS Build to 5.15.13.

Update the version of Qt that is used in the CICD build for MacOS to
5.15.13. This version is showing promise for building binaries that work
on Apple silicon.

Signed-off-by: Michael Keller <github@ike.ch>

.github/workflows/mac.yml

@@ -27,22 +27,25 @@ jobs:
         echo "version=$version" >> $GITHUB_OUTPUT
 
     - name: store dummy version and build number for pull request
+      id: pull_request_version_number
       if: github.event_name == 'pull_request'
       run: |
         echo "100" > latest-subsurface-buildnumber
         echo "CICD-pull-request" > latest-subsurface-buildnumber-extension
+        version=$(scripts/get-version)
+        echo "version=$version" >> $GITHUB_OUTPUT
 
     - name: setup Homebrew
       run: brew install hidapi libxslt libjpg libmtp create-dmg confuse
     - name: set our Qt build
       run: |
-        curl --output ssrf-Qt-5.15.2-mac.tar.xz https://f002.backblazeb2.com/file/Subsurface-Travis/ssrf-Qt5.15.2.tar.xz
-        tar -xJf ssrf-Qt-5.15.2-mac.tar.xz
+        curl -O https://f002.backblazeb2.com/file/Subsurface-Travis/Qt5.15.13-mac.tar.xz
+        tar -xJf Qt*-mac.tar.xz
     - name: build Subsurface
       id: build
       run: |
         cd ${GITHUB_WORKSPACE}/..
-        export QT_ROOT=${GITHUB_WORKSPACE}/Qt5.15.2/5.15.2/clang_64
+        export QT_ROOT=${GITHUB_WORKSPACE}/Qt5.15.13
         export QT_QPA_PLATFORM_PLUGIN_PATH=$QT_ROOT/plugins
         export PATH=$QT_ROOT/bin:$PATH
         export CMAKE_PREFIX_PATH=$QT_ROOT/lib/cmake
@@ -58,6 +61,14 @@ jobs:
         echo "Created $IMG"
         echo "dmg=$IMG" >> $GITHUB_OUTPUT
 
+    - name: publish pull request artifacts
+      if: github.event_name == 'pull_request'
+      uses: actions/upload-artifact@v4
+      with:
+        name: Subsurface-MacOS-${{ steps.pull_request_version_number.outputs.version }}
+        path: ${{ steps.build.outputs.dmg }}
+        compression-level: 0
+
     # only publish a 'release' on push events (those include merging a PR)
     - name: upload binaries
       if: github.event_name == 'push'