From b8472a09f917d098961a65f140843f087d13f7b4 Mon Sep 17 00:00:00 2001
From: lkdvos <ldevos@flatironinstitute.org>
Date: Fri, 24 Jul 2026 12:45:26 -0400
Subject: [PATCH] CI maintenance: native macOS arch + Julia Dependabot

- ci.yml: stop forcing `arch: x64`. `macOS-latest` is now an Apple Silicon
  (arm64) runner, so requesting x64 made setup-julia fail on all macOS jobs.
  Dropping the arch axis lets each runner use its native architecture
  (ubuntu/windows x64, macOS aarch64).
- dependabot.yml: add the `julia` package ecosystem (grouped into a single PR)
  alongside the existing github-actions updates, matching the rest of the
  ecosystem (e.g. MPSKit.jl).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
---
 .github/dependabot.yml   |  8 ++++++++
 .github/workflows/ci.yml | 12 ++++--------
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 700707c..ee8e408 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -5,3 +5,11 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
+  - package-ecosystem: "julia"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups: # group all julia package updates into a single PR
+      all-julia-packages:
+        patterns:
+          - "*"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b242a2e..545a307 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ concurrency:
 
 jobs:
   test:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }}
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
     permissions: # needed to allow julia-actions/cache to proactively delete old caches that it has created
@@ -32,14 +32,13 @@ jobs:
           - ubuntu-latest
           - macOS-latest
           - windows-latest
-        arch:
-          - x64
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
+          # arch omitted: defaults to the runner's native arch
+          # (macOS-latest is Apple Silicon / aarch64)
       - uses: julia-actions/cache@v3
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
@@ -51,7 +50,7 @@ jobs:
           fail_ci_if_error: false
   test-nightly:
     needs: test
-    name: Julia nightly - ${{ matrix.os }} - ${{ matrix.arch }}
+    name: Julia nightly - ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
     permissions: # needed to allow julia-actions/cache to proactively delete old caches that it has created
@@ -65,14 +64,11 @@ jobs:
           - 'nightly'
         os:
           - ubuntu-latest
-        arch:
-          - x64
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v3
         with:
           version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
       - uses: julia-actions/cache@v3
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest