Exclude push to master from linting

Signed-off-by: František Nečas <[email protected]>

Author: FrNecas

.github/workflows/ci.yml

@@ -19,6 +19,7 @@ jobs:
         run: ./build.sh $COMPILER -j4 && cd regression && make test
   lint:
     runs-on: ubuntu-latest
+    if: "github.ref != 'refs/heads/main'"
     steps:
       - uses: actions/checkout@v2
       - name: Get the latest master