Trigger build when pushed to the main branch (#115)

Author: jizusun

.github/workflows/build.yml

@@ -3,6 +3,7 @@ name: build
 on:
   push:
     branches: 
+      - main 
       - master
   pull_request:
     branches:

.github/workflows/codeql-analysis.yml

@@ -2,10 +2,10 @@ name: "CodeQL"
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main, master ]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master ]
+    branches: [ main, master ]
   schedule:
     - cron: '11 0 * * 5'