fix: Firefox installation script version string comparisons

[MikeMcC399]

• closes Firefox installation script version string comparison flawed #1443

Situation

Version string comparisons in factory/installScripts/firefox/install-firefox-version.js are flawed. They will fail if the version of Firefox exceeds 999.

Change

Extract the major version of Firefox, and make numerical comparisons based on this.

The installation script factory/installScripts/firefox/install-firefox-version.js:

• Switches from bz2 to xz (de-)compression for Firefox >=135.x
• Allows installing Firefox >=136.x on arm64

Environment variable	Before	After
FACTORY_VERSION	7.0.0	7.0.1

Verification

• use --no-cache to repeat test

FIREFOX_VERSION	Build message
134.0	Success
134.0.2	Success
135.0	Success
135.0.1	Success
136.0	Success
136.0.4	Success
140.4.0esr	Success
144.0.2	Success
999.0	Fail 404 Not Found
1000.0	Fail 404 Not Found

cd factory
docker compose build factory

export FIREFOX_VERSION='134.0'
docker compose build firefox # expect success

export FIREFOX_VERSION='134.0.2'
docker compose build firefox # expect success

export FIREFOX_VERSION='135.0'
docker compose build firefox # expect success

export FIREFOX_VERSION='135.0.1'
docker compose build firefox # expect success

export FIREFOX_VERSION='136.0'
docker compose build firefox # expect success

export FIREFOX_VERSION='136.0.4'
docker compose build firefox # expect success

export FIREFOX_VERSION='140.4.0esr'
docker compose build firefox # expect success

export FIREFOX_VERSION='144.0.2'
docker compose build firefox # expect success

export FIREFOX_VERSION='999.0.0'
docker compose build firefox # expect 404 error

export FIREFOX_VERSION='1000.0.0'
docker compose build firefox # expect 404 error

cd ..

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