Remove duplicate Github actions for every PR (#166)

* Updating Github CI actions to trigger on pushing to master and for pull requests that target master branch.

* Allow CI on pull requests targeting all branches.

Author: prithvi514

.github/workflows/ci.yml

@@ -1,6 +1,10 @@
 name: ci
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
 
 
 jobs: