Passing base64 encoded file in url breaks the file

Summary

We are passing updated file in url encoded in base64. Passed file in gitlab isn't the same as the updated source file.

Steps to reproduce

Try to update docker images in ansible-roles/elasticsearch project. In vars/main.yml file there are some jinja2 code which may break the file passed by url.

Expected behavior

Docker images in file gets updated

Actual behavior

Docker images in file gets updated but file is broken at some point

Relevant logs and/or screenshots

_elasticsearch_backup_command: >-
  docker run --rm
  --name elasticsearch_backup_{{ _elasticsearch_backup_index }}
  {{ _elasticsearch_backup_container_image }}
  --input={{ _elasticsearch_url }}/{{ _elasticsearch_backup_index }}
  --output=$
  {%- if elasticsearch_backup_compress %}
  | gzip > {{ _elasticsearch_backup_file_path }}.gz
  {% else %}
  [\XX\ؘX\ٚ[W]_BH[Y	_B[\XX\ܙ\ܙW[\ܘ\W\XܞN\[\XX\\\ܙK^[XW]W[YK\
WZXܛ]ZY_K[\XX\ܙ\ܙWٚ[N[\XX\

AND SO ON...

Possible fixes

Use urlenccode with encodeb64 when passing file in url

Line in file