docker: pin to alpine 3.13 for l2geth

[tynes]

Description
A bug has appeared when older versions of Docker are used to build
alpine based images in alpine version 3.14. To prevent this problem
from happening to the users, this PR pins the version to 3.13.

The observed problem is that make cannot run any command and
the error message states Operation not permitted. Removing
make was one way to solve the problem but that would increase
the diff from upstream geth.

See these links for details:
alpinelinux/docker-alpine#182
https://wiki.alpinelinux.org/wiki/Release_Notes_for_Alpine_3.14.0

[changeset-bot]

⚠️ No Changeset found

Latest commit: c3868f4

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[codecov-commenter]

Codecov Report

Merging #1199 (c3868f4) into develop (99e3adb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1199   +/-   ##
========================================
  Coverage    86.05%   86.05%           
========================================
  Files           49       49           
  Lines         1936     1936           
  Branches       307      307           
========================================
  Hits          1666     1666           
  Misses         270      270           

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[smartcontracts]

LGTM. Do you know which versions of Docker are OK and which aren't?

[tynes]

LGTM. Do you know which versions of Docker are OK and which aren't?

This is in github issue link above the easiest way to fix this is to upgrade Docker to version 20.10.0 or later.