Update CI targets to not duplicate

Author: UnsignedArduino

.github/workflows/e2e.yaml

@@ -1,5 +1,14 @@
 name: CI
-on: [ push, pull_request ]
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   e2e:

.github/workflows/lint.yaml

@@ -1,5 +1,14 @@
 name: CI
-on: [ push, pull_request ]
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   lint: