Cleanup for consistency

- Move ENV vars to global list
- Ensure code climate only runs on 1 job

.github/workflows/ci.yaml

@@ -14,22 +14,19 @@ jobs:
         rails-version:
         - '6.0'
         - '6.1'
+    env:
+      TEST_RAILS_VERSION: ${{ matrix.rails-version }}
+      CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true
-      env:
-        TEST_RAILS_VERSION: ${{ matrix.rails-version }}
     - name: Run tests
       run: bundle exec rake
-      env:
-        CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}
-    - if: ${{ github.ref == 'refs/heads/master' && matrix.ruby-version == '2.7' }}
-      name: Report code coverage
+    - name: Report code coverage
+      if: ${{ github.ref == 'refs/heads/master' && matrix.ruby-version == '2.7' && matrix.rails-version == '6.1' }}
       continue-on-error: true
       uses: paambaati/codeclimate-action@v3.0.0
-      env:
-        CC_TEST_REPORTER_ID: ${{ secrets.CC_TEST_REPORTER_ID }}