chore: show 'gem environment' during packaging #571

Job	Run time
build-gem	14s
Use gem to package fontist windows-latest Ruby 3.1.6 CC gcc	23m 8s
Use gem to package metanorma macos-12 Ruby 3.1.6 CC clang	4m 46s
Use gem to package metanorma ubuntu-20.04 Ruby 3.1.6 CC clang	3m 42s
Use gem to package fontist macos-12 Ruby 3.1.6 CC clang	3m 26s
Use gem to package metanorma alpine:3.17 Ruby 3.1.6 CC gcc	11m 30s
Use gem to package fontist ubuntu-20.04 Ruby 3.1.6 CC clang	1m 47s
Use gem to package metanorma macos-14 Ruby 3.1.6 CC clang	3m 8s
Use gem to package fontist alpine:3.17 Ruby 3.1.6 CC gcc	6m 3s
Use gem to package fontist macos-14 Ruby 3.1.6 CC clang	2m 9s
Release gem	29s
	1h 0m 22s

Provide feedback