Adjust triggers to avoid duplicate jobs on push to branches with a PR

Author: oleksandr-pavlyk

.github/workflows/conda-package.yml

@@ -1,6 +1,10 @@
 name: Conda package
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_requests:
 
 env:
   PACKAGE_NAME: dpctl
@@ -268,7 +272,6 @@ jobs:
 
   test_examples_linux:
     needs: build_linux
-    if: ${{ github.event.pull_request }}
     runs-on:  ${{ matrix.runner }}
     strategy:
       matrix: