run go and coverage tests after code is merged to master for sanity check (#162)

.github/workflows/coverage.yml

 name: Coverage
 
-on: [pull_request]
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+    branches:
+      - '**'
 
 jobs:
   coverage:

.github/workflows/go.yml

 name: Go
 
-on: [pull_request]
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+    branches:
+      - '**'
 
 jobs:
   build: