can't override env variables, use script.sh directly

.github/workflows/ci.yml

@@ -5,18 +5,17 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - id: create-commit
-        run: |
+      - run: |
           cp test/only_checked/files/* .
           git add *
           git config user.email "workflow@github.com"
           git config user.name "I am an automated workflow"
           git commit -m auto
-          echo "HEAD_REF=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT
-      - name: rubocop with only_checked
-        uses: ./
-        with:
-          only_changed: 'true'
-        env:
-          PATH: test/only_checked/mock_bins:${{ env.PATH }}
-          HEAD_REF: ${{ steps.create-commit.outputs.HEAD_REF }}
+
+          PATH="test/only_checked/mock_bins:$PATH" \
+            BASE_REF=$(git rev-parse HEAD~) \
+            HEAD_REF=$(git rev-parse HEAD) \
+            INPUT_ONLY_CHANGED=true \
+            INPUT_USE_BUNDLER=false \
+            ./script.sh
+        shell: bash

test/only_checked/mock_bins/rubocop

@@ -3,7 +3,8 @@
 case ARGV
 when %w[--list-target-files]
   puts %w[a.rb b.rb c.rb]
-
+when %W[--require #{ENV['GITHUB_ACTION_PATH']}/rdjson_formatter/rdjson_formatter.rb --format RdjsonFormatter --fail-level error a.rb]
+  puts '{"source":{"name":"rubocop","url":"https://rubocop.org/"},"diagnostics":[],"severity":"INFO"}'
 else
   abort "rubocop mock called with unexpected arguments:\n#{ARGV.join("\n")}"
 end