fix: ping database host instead of resolving dns

[sweatybridge]

What kind of change does this PR introduce?

Bug fix #4503

What is the new behavior?

Sometimes dns may resolve successfully without route to host.

Test connectivity using ping instead.

Additional context

Add any other context or screenshots.

[coveralls]

Pull Request Test Coverage Report for Build 19659828669

Details

• 9 of 15 (60.0%) changed or added relevant lines in 1 file are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.03%) to 55.378%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
internal/utils/flags/db_url.go	9	15	60.0%

Files with Coverage Reduction	New Missed Lines	%
internal/utils/flags/db_url.go	1	42.16%
internal/gen/keys/keys.go	5	12.9%

Totals
Change from base Build 19656528613:	-0.03%
Covered Lines:	6662
Relevant Lines:	12030

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💛 - Coveralls