Add triggers on push to main and pull_request to main (#24)

Author: lukamac

.github/workflows/lint.yml

@@ -1,5 +1,11 @@
 name: Linting
-on: push
+on: 
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 jobs:
   lint:
     runs-on: ubuntu-latest

.github/workflows/test-neureka.yml

@@ -1,5 +1,11 @@
 name: Test Neureka
-on: push
+on: 
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 jobs:
   test-neureka:
     runs-on: ubuntu-latest

.github/workflows/test-neureka_v2.yml

@@ -1,5 +1,11 @@
 name: Test Neureka v2
-on: push
+on: 
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
 jobs:
   test-neureka-v2:
     runs-on: ubuntu-latest