Update Firefox install to install from Mozilla since snap is not avaialable

[eng3]

The Dockerfile uses matlab-deps which is based on an ubuntu image. The current firefox install line in the Docerfile installs the package from the Ubuntu repository which relies on snap. Snap is not installed in the container and thus firefox will not run along with any of the help pages.

Recommend modifying Dockerfile to install firefox properly.

Example:
Add before firefox install: (based on firefox install instructions)
RUN install -d -m 0755 /etc/apt/keyrings && wget -q https://packages.mozilla.org/apt/repo-signing-key.gpg -O- | sudo tee /etc/apt/keyrings/packages.mozilla.org.asc > /dev/null && echo "deb [signed-by=/etc
/apt/keyrings/packages.mozilla.org.asc] http://packages.mozilla.org/apt mozilla main" | sudo tee -a /etc/apt/sources.list.d/mozilla.list > /dev/null && echo "Package: *\nPin: origin packages.mozilla.org\n
Pin-Priority: 1000" | tee /etc/apt/preferences.d/mozilla

(and add wget to deps list)

[epaganon]

Dear @eng3,

Thank you for bringing this to our attention, we truly appreciate your contribution.

I will forward this suggestion to our development team for consideration, and we will evaluate its inclusion in a future release of the image.

Best regards