add release_main_branch to build.py

build.py

@@ -38,6 +38,7 @@ def initialize2(project):
         "project_root_path": PROJECT_ROOT_PATH,
         "build_types": [],
         "mixin_types": ["RELEASE"],
+        "release_main_branch": "main",
         "release_primary_build_file": "build.gradle",
         "release_secondary_build_files": ["build.py"],
         # release artifacts

doc/Release.md

@@ -5,7 +5,7 @@ release-1.2 or release-1.2.3
 
 I.e.: release-X.X.Z where X, Y, Z are the major, minor resp. the patch level of the release. Z can be omitted.
 
-**Note:** Such kind of release tags should only be applied to commits in the master branch.
+**Note:** Such kind of release tags should only be applied to commits in the main branch.
 
 ```
 #adjust [version]