Dockerビルドで git cloneで証明書エラーが発生するときの対応

DockerでPHPの環境作っていたらエラーに遭遇

Using version ^3.1 for laravel/installer
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 16 installs, 0 updates, 0 removals
  - Installing symfony/process (v5.0.8): Downloading (failed)       
Downloading (failed)       
Downloading (failed)    Failed to download symfony/process from dist: The "https://api.github.com/repos/symfony/process/zipball/3179f68dff5bad14d38c4114a1dab98030801fd7" file could not be downloaded: SSL operation failed with code 1. OpenSSL Error messages:
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
Failed to enable crypto
failed to open stream: operation failed
    Now trying to download from source
  - Installing symfony/process (v5.0.8): Cloning 3179f68dff


Installation failed, deleting ./composer.json.

                                                                                                                                           
  [RuntimeException]                                                                                                                       
  Failed to clone https://github.com/symfony/process.git via https, ssh protocols, aborting.                                               
                                                                                                                                           
  - https://github.com/symfony/process.git                                                                                                 
    Cloning into '/composer/vendor/symfony/process'...                                                                                     
    fatal: unable to access 'https://github.com/symfony/process.git/': server certificate verification failed. CAfile: none CRLfile: none  

どうやら、以下でソースをgitからcloneしてくる処理でコケたらしい。
composer global require "laravel/installer"

対策

DockerfileのRUNコマンドにexport GIT_SSL_NO_VERIFY=1を追記

RUN export GIT_SSL_NO_VERIFY=1 \
  && composer global require "laravel/installer"

ちなみにexportコマンドはターミナルからログアウトもしくはexitするまで保持される。