Replace curl with wget (Addresses #2675)

[vexdev]

Replace curl with wget as curl is not available from the base image.
Simple proposal to address #2675

[StaNov]

Thank you for your contribution, it looks working :)

Minor comment: wget can be called with the --spider parameter not to download the content, just check the HTTP code.

Also the || exit 1 is redundant, since it is the default wget functionality.

Suggested change

	CMD wget -q -O - http://127.0.0.1:$HEALTHCHECK_PORT/actuator/health || exit 1
	CMD wget --spider -q http://127.0.0.1:$HEALTHCHECK_PORT/actuator/health

[cyyynthia]

It is not redundant; wget doesn't always exit with exit code 1 which is the expected code for unhealthy containers, not just non-zero. While it works, the Dockerfile reference explicitly expects an exit code 1, reserves the exit code 2, and makes no mention of other exit codes making them effectively undefined behavior.

• https://docs.docker.com/reference/dockerfile/#healthcheck
• https://man.archlinux.org/man/wget.1.en#EXIT_STATUS

[JanCizmar]

@StaNov Can you please finalize this so we can merge it? 🙏

[StaNov]

I have to create a new PR because I cannot work on this branch.

@vexdev FYI, if you were able to finish it in a matter of hours, I'd leave it to you.

@cyyynthia, thanks for the explanation, I didn't know this healthcheck contract.

[StaNov]

FYI, I created a new PR #2694. I credited @vexdev in the description.

[vexdev]

No worries I'm not after credits only helpful contributions when I can :)

[JanCizmar]

It's fixed here: #2694

Thanks to all for contributions!