Prep to rename default branch to main

Author: malfet

.github/workflows/build-conda-images.yml

@@ -3,7 +3,7 @@ name: Build conda docker images
 on:
   push:
     branches:
-      master
+      main
     paths:
       - conda/Dockerfile
       - 'common/*'

.github/workflows/build-libtorch-images.yml

@@ -3,7 +3,7 @@ name: Build libtorch docker images
 on:
   push:
     branches:
-      master
+      main
     paths:
       - libtorch/Dockerfile
       - 'common/*'

.github/workflows/build-llvm-images.yml

@@ -3,7 +3,7 @@ name: Build llvm docker images
 on:
   push:
     branches:
-      master
+      main
     paths:
       - llvm/*
       - .github/workflows/build-llvm-images.yml

.github/workflows/build-magma-windows.yml

@@ -3,7 +3,7 @@ name: Build MAGMA for Windows
 on:
   push:
     branches:
-      master
+      main
     paths:
       - windows/internal/build_magma.bat
   pull_request:

.github/workflows/build-manywheel-images.yml

@@ -3,7 +3,7 @@ name: Build manywheel docker images
 on:
   push:
     branches:
-      master
+      main
     paths:
       - .github/workflows/build-manywheel-images.yml
       - manywheel/Dockerfile