ci: Build YJIT enabled matrix

- Remove `doc-build-latest-with-yjit` since it's covered by matrix
- switch YJIT using `RUBY_YJIT_ENABLE`

.github/workflows/ci.yml

@@ -9,7 +9,12 @@ on:
 jobs:
   jekyll-build:
     runs-on: ubuntu-latest
-    name: Jekyll Build
+    name: Jekyll Build (YJIT_ENABLED ${{ matrix.yjit-enabled }})
+    strategy:
+      matrix:
+        yjit-enabled: [0, 1]
+    env:
+      RUBY_YJIT_ENABLE: ${{ matrix.yjit-enabled }}
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
@@ -21,25 +26,12 @@ jobs:
 
   doc-build-latest:
     runs-on: ubuntu-latest
-    name: Rails Doc Build (latest)
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: true
-      - name: fetch Rails tags
-        run: cd rails && git fetch --depth=1 origin refs/tags/v7*:refs/tags/v7*
-      - uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 3.3
-          bundler-cache: true
-      - name: Doc Build
-        run: rake build
-
-  doc-build-latest-with-yjit:
-    runs-on: ubuntu-latest
-    name: Rails Doc Build (latest, with YJIT enabled)
+    name: Rails Doc Build (latest, YJIT_ENABLED ${{ matrix.yjit-enabled }})
+    strategy:
+      matrix:
+        yjit-enabled: [0, 1]
     env:
-      RUBY_YJIT_ENABLE: true
+      RUBY_YJIT_ENABLE: ${{ matrix.yjit-enabled }}
     steps:
       - uses: actions/checkout@v4
         with: