ci: log gem env in CI

Author: flavorjones

.github/workflows/ci.yml

@@ -198,7 +198,9 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-      - run: ruby --version
+      - run: |
+          ruby --version
+          gem env
       - name: Download gem-${{matrix.platform}}
         uses: actions/download-artifact@v3
         with:
@@ -254,7 +256,9 @@ jobs:
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-      - run: ruby --version
+      - run: |
+          ruby --version
+          gem env
       - name: Download gem-${{matrix.platform}}-static
         uses: actions/download-artifact@v3
         with: