style.yml: Don't run this on branch pushes

We don't need to run this on branch pushes, just pull requests. It's
designed to be a gross filter for incoming commits, not something
perfect we need to keep green. It also doesn't work quite right for
branch pushes anyway and needs adjustment.

Also remove some debugging information. We don't need it anymore.

Noticed by:	jrtc27
Sponsored by:	Netflix

.github/workflows/style.yml

@@ -7,8 +7,6 @@ name: Style Checker
 # is proving elusive, so optimizations welcome.
 
 on:
-  push:
-    branches: [ main, 'stable/13', 'stable/14' ]
   pull_request: # maybe pull_request_target
     branches: [ main ]
     types: [ opened, reopened, edited ]
@@ -26,10 +24,6 @@ jobs:
         with:
           fetch-depth: 0
           ref: ${{ github.event.pull_request.head.sha }}
-      - name: Dump GitHub context
-        env:
-          GITHUB_CONTEXT: ${{ toJson(github) }}
-        run: echo "$GITHUB_CONTEXT"
       - name: Install packages
         run: |
           sudo apt-get update --quiet || true