Use one functional test to ensure everything works,
no unit tests with heavy mocking.
Update mjml to fix security issues and allow new options.
Provide GitHub Actions. This is a public extension with free minutes
which should ensure that existing setup still works.
* [TASK][SECURITY][!!!] Update to mjml 4 due to security npm issues
* WIP|TASK: Fix broken test
Fix error in test.
Still the expected HTML is not as returned from mjml.
* [TASK] Remove comment generated by the consoleOutput in the test
* [TASK] Modify Expected.html to fit generated entry
* [TASK] Add same conversions on both outputs
* [TASK] Try with phpunit assertStringEqualsFile function
* [TASK] remove the \n again
* [BUGFIX] Add some compression configs to keep it small
* [BUGFIX] reduce line length
