From efcc974726d59e07205e7b9666bb1714dd6b097a Mon Sep 17 00:00:00 2001
From: Wilson La <git@wilsonla.ca>
Date: Fri, 18 Sep 2026 10:14:06 -0700
Subject: [PATCH] ci: run AWS fork workflows on cortex-main instead of main

Point trailer-lint, aws-fork-ci, aws-changes (and upstream-sync where
present) at cortex-main. main will mirror upstream and carry no
AWS/AMP-specific automation.

AWS-Change: build
AWS-Component: alertmanager
Upstream-Status: none
Issue: PROMET-12348
---
 .github/workflows/aws-changes.yml  | 8 ++++----
 .github/workflows/aws-fork-ci.yml  | 4 ++--
 .github/workflows/trailer-lint.yml | 2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/.github/workflows/aws-changes.yml b/.github/workflows/aws-changes.yml
index 31caad9c09..007cf9db7f 100644
--- a/.github/workflows/aws-changes.yml
+++ b/.github/workflows/aws-changes.yml
@@ -1,7 +1,7 @@
 name: aws-changes
 on:
   push:
-    branches: [main]
+    branches: [cortex-main]
   schedule:
     - cron: "0 8 * * MON"     # catches upstream-absorbed changes retiring without a merge
   workflow_dispatch: {}
@@ -33,16 +33,16 @@ jobs:
             --upstream-ref "upstream/$UPSTREAM_BRANCH" \
             --repo-url "https://github.com/$REPO" \
             --source-sha "$SOURCE_SHA" \
-            --source-ref "refs/heads/main" > /tmp/publish/AWS-CHANGES.md
+            --source-ref "refs/heads/cortex-main" > /tmp/publish/AWS-CHANGES.md
           cat > /tmp/publish/README.md <<'EOF'
           # AWS-CHANGES publish branch
 
           This orphan branch carries only the auto-generated manifest of AWS changes
           this fork holds on top of upstream Alertmanager: **[AWS-CHANGES.md](AWS-CHANGES.md)**.
 
-          It is regenerated by the `aws-changes` workflow on every push to `main`
+          It is regenerated by the `aws-changes` workflow on every push to `cortex-main`
           (plus weekly, to retire changes upstream has absorbed). Nothing here is
-          edited by hand, and no pull request is involved. Code lives on `main`.
+          edited by hand, and no pull request is involved. Code lives on `cortex-main`.
           EOF
       - name: Publish to the manifest branch
         env:
diff --git a/.github/workflows/aws-fork-ci.yml b/.github/workflows/aws-fork-ci.yml
index 18c0f2adec..451d5cc525 100644
--- a/.github/workflows/aws-fork-ci.yml
+++ b/.github/workflows/aws-fork-ci.yml
@@ -1,9 +1,9 @@
 name: aws-fork-ci
 on:
   pull_request:
-    branches: [main, "release-*"]
+    branches: [cortex-main, "release-*"]
   push:
-    branches: [main]
+    branches: [cortex-main]
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/trailer-lint.yml b/.github/workflows/trailer-lint.yml
index 92429d4606..37afa92f65 100644
--- a/.github/workflows/trailer-lint.yml
+++ b/.github/workflows/trailer-lint.yml
@@ -1,7 +1,7 @@
 name: trailer-lint
 on:
   pull_request:
-    branches: [main]
+    branches: [cortex-main]
 jobs:
   trailer-lint:
     if: ${{ !startsWith(github.head_ref, 'sync/upstream-') }}