Build Firefox developer edition

[l0b0]

Resolves #536.

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[diemol]

Hi @l0b0,

Thanks for this PR!

Nevertheless, we would not push a new image with Firefox Developer Edition to Docker Hub. The current images try to be as generic as possible, and this is not a common use case. The idea is that it should work in the same way as the Nightly or Chrome Beta, in the sense that if anyone needs that image, s/he should build it on her/his own.

Having said that, this is the part that we would accept. Could you please modify the PR so it only includes that? Thanks!

[ddavison]

LGTM 👍

[diemol]

Ah cool, I triggered again the build last night and it worked. Let's merge.
Thanks @l0b0

[denishowew]

An image for Firefox developer edition would let us test our browser extension without having to go through Mozilla's slow and flaky signing process every time. Dev edition is the only way to load unsigned extensions.

[diemol]

As mentioned above, we want to offer generic images, and aside from that, we do not have the capacity to maintain an image with a browser that has not been released yet. If issues are raised to its behavior, only the time spent to triage them is already an overhead for us. That is why we offer instructions for the community on how to do it, and with that unblock themselves, anyone can set a CI env and build that image on a daily basis if wished.