[buildbot] ci: switch to main branch

[LEDE Commits]

ynezz pushed a commit to buildbot.git, branch main:
https://git.openwrt.org/7e344cb5ba9acf7fb2fa7a8848bec12db926a3e0

commit 7e344cb5ba9acf7fb2fa7a8848bec12db926a3e0
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Sat Sep 28 07:08:09 2024 +0000

    ci: switch to main branch
    
    References: https://openwrt.org/voting/2023-02-27
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 .github/workflows/build-push.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/build-push.yml b/.github/workflows/build-push.yml
index fa4993c..dcbf8d9 100644
--- a/.github/workflows/build-push.yml
+++ b/.github/workflows/build-push.yml
@@ -2,7 +2,7 @@ name: Build and push containers
 on:
   push:
     branches:
-      - master
+      - main
     tags:
       - 'v*'
   pull_request: