The tests e2e need the mail template to
send the invitation to the user.
We are now caching the mail template instead
of using a artifact, thanks to that we can
build only the mail template if the cache is
invalidated, so we save time and resources.
Add a test to check the pdf export of the
impress app.
It intercept the download of the PDF and
read its content.
We can assert that the template is correctly
rendered, and that the pad text is present as
well.
