Allow actions to use branches other than master

.github/workflows/build.yml

@@ -3,12 +3,12 @@ name: Build Audacity
 on:
   push:
     # Remove the "#" from the next 2 lines if you need to disable this action
-    #branches:
-    #  - disable
+    branches:
+      - disable
   pull_request:
     # Remove the "#" from the next 2 lines if you need to disable this action
-    #branches:
-    #  - disable
+    branches:
+      - disable
 
 jobs:
   build:

.github/workflows/cmake_build.yml

@@ -63,8 +63,8 @@ jobs:
     # =========================================================================
     - name: Checkout
       uses: actions/checkout@v2
-      with:
-        ref: master
+    #  with:
+    #    ref: master
 
     # =========================================================================
     # SHARED: Retrieve git hashes and set up for cache