Try container, but it will probably fail

.gitea/workflows/lint.yaml

@@ -0,0 +1,19 @@
+name: Linting
+
+on:
+  pull_request:
+
+jobs:
+  lint:
+    runs-on: cth-ubuntu-latest
+    container:
+      image: docker.atomaka.com/mdformat
+    steps:
+      - run: mdformat --check _posts/
+  build:
+    runs-on: cth-ubuntu-latest
+    steps:
+      - run: |
+          gem install bundler
+          bundle install
+          bundle exec jekyll build

Gemfile.lock

@@ -36,6 +36,7 @@ GEM
     faraday-net_http (3.0.2)
     ffi (1.15.5)
     forwardable-extended (2.6.0)
+    google-protobuf (3.21.12)
     google-protobuf (3.21.12-x86_64-linux)
     htmlbeautifier (1.4.2)
     htmlcompressor (0.4.0)
@@ -98,6 +99,8 @@ GEM
       tomlrb
     mixlib-shellout (3.2.7)
       chef-utils
+    nokogiri (1.14.1-arm64-darwin)
+      racc (~> 1.4)
     nokogiri (1.14.1-x86_64-linux)
       racc (~> 1.4)
     octokit (4.25.1)
@@ -132,6 +135,7 @@ GEM
     webrick (1.8.1)
 
 PLATFORMS
+  arm64-darwin-23
   x86_64-linux
 
 DEPENDENCIES