Try to fix CI issue on Ruby 2.5 (#2021)

* Try to fix CI issue on Ruby 2.5

* Add CI environment variable in CI

Don't install rdoc in CI (should fix ruby 2.5 CI issue due to pysch).

Don't install bake-test-external in CI tests not using it.

Move webrick to the test group in the Gemfile.

3 files changed, 13 insertions, 6 deletions

diff --git a/.github/workflows/test-external.yaml b/.github/workflows/test-external.yaml
index 59c25ef4..8bb08027 100644
--- a/.github/workflows/test-external.yaml
+++ b/.github/workflows/test-external.yaml
@@ -14,6 +14,8 @@ jobs:
         ruby: ['2.7', '3.0', '3.1']
 
     runs-on: ${{matrix.os}}
+    env:
+      CI: external
 
     steps:
     - uses: actions/checkout@v3
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 697b3cd2..bed3de9f 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -26,6 +26,8 @@ jobs:
           - os: macos-latest
             ruby: '3.1'
     runs-on: ${{matrix.os}}
+    env:
+      CI: spec
 
     steps:
     - uses: actions/checkout@v3
diff --git a/Gemfile b/Gemfile
index 2b58d070..c5d10126 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,18 +4,21 @@ source 'https://rubygems.org'
 
 gemspec
 
-gem "webrick"
-
 group :maintenance, optional: true do
   gem "rubocop", require: false
   gem "rubocop-packaging", require: false
 end
 
-group :doc do
-  gem 'rdoc'
+unless ENV['CI']
+  group :doc do
+    gem 'rdoc'
+  end
 end
 
 group :test do
-  gem 'minitest'
-  gem 'bake-test-external', '~> 0.1.3'
+  gem "webrick"
+
+  unless ENV['CI'] == 'spec'
+    gem 'bake-test-external', '~> 0.1.3'
+  end
 end