feat: area/promtail: Add support to install wget on promtail docker image to support docker healthcheck

[Sheikh-Abubaker]

What this PR does / why we need it:
Users will now be able to make http request on the promtail API to do the healthcheck.
Which issue(s) this PR fixes:
Fixes #11590

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• Documentation added
• Tests updated
• CHANGELOG.md updated
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[cstyan]

Can you elaborate on what your end goal is here? It's not entirely clear to me. Promtail already serves all of it's endpoints on an HTTP port.

We also have some users asking for images with even less dependencies, like a scratch image with only our binaries. I think we're more likely to go towards that direction than installing more packages.

[Sheikh-Abubaker]

Can you elaborate on what your end goal is here? It's not entirely clear to me. Promtail already serves all of it's endpoints on an HTTP port.

@cstyan As you can see the issue #11590 it says there @efficks wants to enable healthcheck on the grafana/promtail docker image but wget or curl is not installed on the image.

To verify the above I went on to check it on my system and found out wget is not installed in grafana/promtail docker image:

sheikhabubaker@DESKTOP-TFVM3PT:~$ docker pull grafana/promtail
Using default tag: latest
latest: Pulling from grafana/promtail
Digest: sha256:c9f886511f40d2cfce44fcbcf650d632c7c73b98a96ee15f4e72ed52e68e7cdc
Status: Image is up to date for grafana/promtail:latest
docker.io/grafana/promtail:latest

What's Next?
  View a summary of image vulnerabilities and recommendations → docker scout quickview grafana/promtail
sheikhabubaker@DESKTOP-TFVM3PT:~$ docker run -it --rm --name promtail-cont --entrypoint /bin/sh grafana/promtail:latest
# wget --version
/bin/sh: 1: wget: not found
#

To install wget onto the grafana/promtail docker image I appended wget to package installing stage into Dockerfile.

[cstyan]

I commented on the related issue, no response from the original issue reporter yet: #11590 (comment)

[cstyan]

@Sheikh-Abubaker okay, we can move forward with adding wget to the image. I'm not sure what's happened with the CLA check, you could try squashing all the commits into one but it might actually just be easiest to create a new branch locally off of main and force push to the branch this PR is open for.

[Sheikh-Abubaker]

@cstyan done!!

[cstyan]

thanks for your patience @Sheikh-Abubaker

[Sheikh-Abubaker]

thanks for your patience @Sheikh-Abubaker

@cstyan you're welcome, thanks for your support too 😀!!

[chaudum]

@Sheikh-Abubaker We would like to remove wget from the image again to reduce vulnerability attack surface, see #15101
The health check can be achieved in other ways without wget as well. I wanted to inform you, because the removal may be controversial :)

[Sheikh-Abubaker]

@chaudum No worries!