use latest version of alpine when building the Docker container

[ad-m]

No description provided.

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "patch-1" git@github.com:ad-m/distribution.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[codecov]

Codecov Report

Merging #2991 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2991      +/-   ##
==========================================
- Coverage   60.69%   60.64%   -0.05%     
==========================================
  Files         102      102              
  Lines        8044     8044              
==========================================
- Hits         4882     4878       -4     
- Misses       2511     2514       +3     
- Partials      651      652       +1

Flag	Coverage Δ
#linux	60.64% <ø> (-0.05%)	⬇️

Impacted Files	Coverage Δ
registry/handlers/app.go	48.16% <0%> (-0.7%)	⬇️

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[thaJeztah]

LGTM

@dmcgowan PTAL

[ad-m]

Can I help you in some way?

[thaJeztah]

let me try getting a maintainer to review 🤗

[caervs]

LGTM!

[ad-m]

Is there anything what I can do to help merge that PR?

[ad-m]

Thanks!