refactor: fetch tags inside the loop

Author: toshimaru

.github/workflows/ci.yml

@@ -61,12 +61,11 @@ jobs:
         with:
           submodules: true
       - name: fetch Rails tags
+        working-directory: rails
         run: |
-          cd rails && git fetch --depth=1 origin \
-            refs/tags/v8*:refs/tags/v8* \
-            refs/tags/v7*:refs/tags/v7* \
-            refs/tags/v6*:refs/tags/v6* \
-            refs/tags/v5.2*:refs/tags/v5.2*
+          for version in v8 v7 v6 v5.2; do
+            git fetch --depth=1 origin refs/tags/${version}*:refs/tags/${version}*
+          done
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.7