ci(workflows): Update workflow branch filter (#32)

* run codestyle on every branch, run build only on master

* remove whitelines

Author: sogladev

.github/workflows/core-build.yml

@@ -1,7 +1,11 @@
 name: core-build
 on:
   push:
+    branches:
+      - 'master'
   pull_request:
+    branches:
+      - 'master'
   workflow_dispatch:
 
 jobs:

.github/workflows/core_codestyle.yml

@@ -1,19 +1,15 @@
 name: Codestyle Checks
 on:
   push:
-      branches: [ master ]
   pull_request:
-      branches: [ master ]
 
 jobs:
   check-codestyle:
     strategy:
       fail-fast: false
-
     runs-on: ubuntu-latest
     name: Check Codestyling
     steps:
       - uses: actions/checkout@v2
-
       - name: Check Codestyling
         run: source ./apps/ci/ci-codestyle.sh