sync_default_gems.yml: Detect past renames

Author: k0kubun

.github/workflows/sync_default_gems.yml

@@ -36,21 +36,19 @@ jobs:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         name: Check out ruby/ruby
         with:
+          fetch-depth: 0 # Fetch all history to recognize past renames
           token: ${{ github.repository == 'ruby/ruby' && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
 
+      - name: Increase rename limit
+        run: git config merge.renameLimit 999999
+
       - name: Run tool/sync_default_gems.rb
         run: ruby tool/sync_default_gems.rb "${gem_name}" "${gem_before}..${gem_after}"
         env:
           gem_name: ${{ github.event.client_payload.gem || github.event.inputs.gem }}
           gem_before: ${{ github.event.client_payload.before || github.event.inputs.before }}
           gem_after: ${{ github.event.client_payload.after || github.event.inputs.after }}
 
-      - name: Check diffs
-        id: diff
-        run: |
-          git diff --color --no-ext-diff --ignore-submodules --exit-code ||
-          echo update=true >> $GITHUB_OUTPUT
-
       - name: Push
         run: |
           git pull --ff-only origin ${GITHUB_REF#refs/heads/}
@@ -59,7 +57,6 @@ jobs:
           EMAIL: [email protected]
           GIT_AUTHOR_NAME: git
           GIT_COMMITTER_NAME: git
-        if: ${{ steps.diff.outputs.update }}
 
       - uses: ./.github/actions/slack
         with: