[llvm] [Github] Build CI Containers in Stacked PRs (PR #149346)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/149346

Currently the pull_request event on the build CI container workflows are restricted to main. This prevents building them on stacked PRs. This is a bit annoying because we do not get the CI to test that everything is working until all of the base PRs have landed and the target branch becomes main.

>From 9877d2faf83d37a8ebee5afa6189544795f63987 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Thu, 17 Jul 2025 16:08:57 +0000
Subject: [PATCH] [Github] Build CI Containers in Stacked PRs

Currently the pull_request event on the build CI container workflows are
restricted to main. This prevents building them on stacked PRs. This is
a bit annoying because we do not get the CI to test that everything is
working until all of the base PRs have landed and the target branch
becomes main.
---
 .github/workflows/build-ci-container-windows.yml | 2 --
 .github/workflows/build-ci-container.yml         | 2 --
 2 files changed, 4 deletions(-)

diff --git a/.github/workflows/build-ci-container-windows.yml b/.github/workflows/build-ci-container-windows.yml
index 59079f057d021..f76c69f29fb30 100644
--- a/.github/workflows/build-ci-container-windows.yml
+++ b/.github/workflows/build-ci-container-windows.yml
@@ -11,8 +11,6 @@ on:
       - .github/workflows/build-ci-container-windows.yml
       - '.github/workflows/containers/github-action-ci-windows/**'
   pull_request:
-    branches:
-      - main
     paths:
       - .github/workflows/build-ci-container-windows.yml
       - '.github/workflows/containers/github-action-ci-windows/**'
diff --git a/.github/workflows/build-ci-container.yml b/.github/workflows/build-ci-container.yml
index 3159aae32ca51..7f01264af8534 100644
--- a/.github/workflows/build-ci-container.yml
+++ b/.github/workflows/build-ci-container.yml
@@ -11,8 +11,6 @@ on:
       - .github/workflows/build-ci-container.yml
       - '.github/workflows/containers/github-action-ci/**'
   pull_request:
-    branches:
-      - main
     paths:
       - .github/workflows/build-ci-container.yml
       - '.github/workflows/containers/github-action-ci/**'