Attempt to fix macos CI

Author: ogoffart

.github/workflows/rust.yml

@@ -14,11 +14,16 @@ jobs:
   build:
     env:
       QT_QPA_PLATFORM: offscreen
+      DYLD_FRAMEWORK_PATH: /Users/runner/work/qmetaobject-rs/Qt/5.15.2/clang_64/lib
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, windows-latest]
         qt: [5.15.2, 5.9.9, 5.12.9]
         rust: [stable, nightly]
+        include:
+          - os: macos-latest
+            rust: stable
+            qt: 5.15.2
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2