TestPing failures when running during docker container build

[sashkab]

Describe the bug

After upgrading to gatus 5.8.0, TestPing fails when run while building Dockerfile. This seems to be relates to the code in lines 95-99 of client_test.go

What do you see?

#9 58.95 ok  	github.com/TwiN/gatus/v5/alerting/provider/twilio	1.016s
#9 60.44 ok  	github.com/TwiN/gatus/v5/api	1.438s
#9 60.44 --- FAIL: TestPing (0.55s)
#9 60.44     client_test.go:95: expected true
#9 60.44     client_test.go:97: Round-trip time returned on failure should've been 0
#9 60.44 FAIL
#9 60.44 FAIL	github.com/TwiN/gatus/v5/client	1.350s

What do you expect to see?

Expected to test to pass.

List the steps that must be taken to reproduce this issue

Modify Dockerfile to enable tests and run docker build . --file Dockerfile.

Version

5.8.0

Additional information

Seems to be related to #661, when attempting to ping ::1 on container which supports only ipv4...