chore: add local preview make target

[kilianc]

No description provided.

[github-actions]

🔗 Code Coverage Report for go-test-app-01/ at af125d3

📔 Total: 66.7%
🎯 Threshold: 66.7%
✅ 66.7% >= 66.7%

Full coverage report

cointoss/foo.go:3:	foo		100.0%
cointoss/main.go:10:	main		83.3%
cointoss/main.go:23:	tossCoin	66.7%
cointoss/main.go:31:	maybe		66.7%
cointoss/main.go:39:	printColor	40.0%
total:			(statements)	66.7%

^{go-beautiful-html-coverage ↗}

[github-actions]

🔗 Code Coverage Report for go-test-app-02/ at af125d3

📔 Total: 66.7%

Full coverage report

cointoss/foo.go:3:	foo		100.0%
cointoss/main.go:10:	main		83.3%
cointoss/main.go:23:	tossCoin	66.7%
cointoss/main.go:31:	maybe		66.7%
cointoss/main.go:39:	printColor	40.0%
total:			(statements)	66.7%

^{go-beautiful-html-coverage ↗}