give github actions better names

.github/workflows/black.yml

@@ -1,6 +1,10 @@
-name: Check formatting
+name: Check code style
 
-on: [push, pull_request]
+on:
+  push:
+    branches: [ "dev" ]
+  pull_request:
+    branches: [ "dev" ]
 
 jobs:
   lint:

.github/workflows/build-flake.yml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a single version of Python
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Python application
+name: Check module can be imported
 
 on:
   push:

.github/workflows/linter.yml

@@ -1,4 +1,4 @@
-name: flake8 Lint
+name: Check for errors with flake8
 
 on:
   push: