Fixed https proxy issue by installing 'full' wget in Docker alpine-based build stage

[IzabellaRaulin]

The default alpine 'wget' cannot handle https proxies. The solution is installing wget via apk add wget.

More about it you can read here: https://gitlab.alpinelinux.org/alpine/aports/-/issues/10446

Before:

Executing busybox-1.31.1-r16.trigger
OK: 632 MiB in 105 packages
Removing intermediate container 2c082d006a1d
 ---> 62ad5850270c
Step 3/19 : RUN wget https://sourceforge.net/projects/perfmon2/files/libpfm4/libpfm-4.10.1.tar.gz &&   tar -xzf libpfm-4.10.1.tar.gz &&   rm libpfm-4.10.1.tar.gz
 ---> Running in 4e852f499181
Connecting to proxy [...]
wget: server returned error: HTTP/1.1 400 Bad Request

After:

Executing busybox-1.31.1-r16.trigger
OK: 634 MiB in 108 packages
Removing intermediate container fb9929f9946a
 ---> f43faec7c894
Step 3/19 : RUN wget https://sourceforge.net/projects/perfmon2/files/libpfm4/libpfm-4.10.1.tar.gz &&   tar -xzf libpfm-4.10.1.tar.gz &&   rm libpfm-4.10.1.tar.gz
 ---> Running in ea6de57879c2
--2020-08-20 12:38:30--  https://sourceforge.net/projects/perfmon2/files/libpfm4/libpfm-4.10.1.tar.gz
Resolving proxy [...]
Proxy request sent, awaiting response... 200 OK
Length: 1005988 (982K) [application/x-gzip]
Saving to: 'libpfm-4.10.1.tar.gz'
[...]
2020-08-20 12:38:55 (673 KB/s) - 'libpfm-4.10.1.tar.gz' saved [1005988/1005988]

[k8s-ci-robot]

Hi @IzabellaRaulin. Thanks for your PR.

I'm waiting for a google member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[katarzyna-z]

lgtm

[dashpole]

/ok-to-test

[IzabellaRaulin]

All check passed, but it still needs review. @dashpole, might I ask you to review it?

[dashpole]

lgtm