gci: Only test pushes if it's master

Should avoid many of the duplicate test runs

.github/workflows/bsd.yml

@@ -1,6 +1,10 @@
 name: FreeBSD Test
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
 
 jobs:
   testfreebsd:

.github/workflows/ci.yaml

@@ -1,6 +1,10 @@
 ---
 name: Continuous Integration
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - "master"
+  pull_request:
 jobs:
   smoke-test:
     name: Smoke Test ${{ matrix.cfg }}

.github/workflows/macos.yaml

@@ -1,6 +1,7 @@
 ---
 name: Mac OS pytest
-on: [pull_request]
+on:
+  pull_request:
 jobs:
   smoke-test:
     name: Smoke Test macOS