Improve CI definitons (#153)

Author: sobolevn

.github/workflows/ci.yml

@@ -2,12 +2,18 @@ name: Test and lint
 
 on:
   push:
+    branches:
+      - main
   pull_request:
   workflow_dispatch:
 
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   tests:
     name: Run tests

.github/workflows/package.yml

@@ -2,11 +2,18 @@ name: Test packaging
 
 on:
   push:
+    branches:
+      - main
   pull_request:
+  workflow_dispatch:
 
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   wheel:
     name: Test wheel install
@@ -23,7 +30,7 @@ jobs:
       - name: Install pypa/build
         run: |
           # Be wary of running `pip install` here, since it becomes easy for us to
-          # accidentally pick up typing_extensions as installed by a dependency 
+          # accidentally pick up typing_extensions as installed by a dependency
           python -m pip install --upgrade build
           python -m pip list
 
@@ -53,7 +60,7 @@ jobs:
       - name: Install pypa/build
         run: |
           # Be wary of running `pip install` here, since it becomes easy for us to
-          # accidentally pick up typing_extensions as installed by a dependency 
+          # accidentally pick up typing_extensions as installed by a dependency
           python -m pip install --upgrade build
           python -m pip list