Move default branch to main

Author: nmburgan

.github/workflows/component_diff_check.yaml

@@ -4,7 +4,7 @@ name: Vanagon Component Diff
 on:
   pull_request:
     branches:
-      - master
+      - main
 
 jobs:
   vanagon_component_diff_check:

.github/workflows/runtime_tests.yaml

@@ -2,9 +2,9 @@ name: Runtime tests
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
+    branches: [main]
 
 permissions:
   contents: read

tasks/vanagon_component_diff.rake

@@ -127,7 +127,7 @@ namespace :vanagon do |args|
       files
     end
 
-    git_from_rev = 'origin/master'
+    git_from_rev = 'origin/main'
     git_to_rev = 'HEAD'
     default_projects = ['agent-runtime-main']
     projects = []