From 71b36c54c0c0bb9f3129c8159e64698196c9da91 Mon Sep 17 00:00:00 2001
From: Chayoung You <yousbe@gmail.com>
Date: Tue, 15 Oct 2024 20:51:23 +0900
Subject: [PATCH] Run build CI also with Jekyll < 4.0

---
 .github/workflows/main.yml | 6 ++++++
 Gemfile                    | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 333b7a76..4918f187 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -12,6 +12,11 @@ concurrency:
 jobs:
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        jekyll: ["< 4.0", "< 5.0"]
+    env:
+      JEKYLL_VERSION: ${{ matrix.jekyll }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -28,6 +33,7 @@ jobs:
         env:
           JEKYLL_ENV: production
       - name: Upload artifact
+        if: ${{ matrix.jekyll == "< 5.0" }}
         uses: actions/upload-pages-artifact@v3
 
   pa11y-ci:
diff --git a/Gemfile b/Gemfile
index 866a9680..39e5ae10 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,6 @@
 source "https://rubygems.org"
 gemspec
 
+gem "jekyll", ENV["JEKYLL_VERSION"] if ENV["JEKYLL_VERSION"]
+gem "kramdown-parser-gfm" if ENV["JEKYLL_VERSION"] == "< 4.0"
 gem "webrick"