Prepare 5.5.1 hotfix release (#747)

* Initial plan

* version numbers 5.5.1

Co-authored-by: sstidl <12804296+sstidl@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: sstidl <12804296+sstidl@users.noreply.github.com>

version numbers 5.5.0

version 6.0.0pre1

version numbers 5.5.0

Bumped version to 5.4.1

Release 5.4 (#645)

* Initial implementation of ipinfo.io offline database

* Removed unnecessary code

* add: download ipinfo db during docker build

* fixed workflow

* rename warning in workflow

* commit to trigger workflow

* Refactor getIP

* Improved UI

* Updated docker version with 5.4 changes

* Updated README.md

* Added fallback in getIP in case the offline db is missing

* Fixed typos

* just md linting

* Removed vscode stuff

* Implemented fallback in getIP for PHP<8 (returns only the IP)

* Updated doc.md

* Fixed comments in telemetry_settings.php

* New quick start video

* Corrected image name in doc_docker.md

* Replaced speedtest with just test in stats.php

* docker documentation update

* typo

---------

Co-authored-by: Federico Dossena <info@fdossena.com>
Co-authored-by: Stefan Stidl <stefan.stidl@ffg.at>

Release 5.4 (#645)

* Initial implementation of ipinfo.io offline database

* Removed unnecessary code

* add: download ipinfo db during docker build

* fixed workflow

* rename warning in workflow

* commit to trigger workflow

* Refactor getIP

* Improved UI

* Updated docker version with 5.4 changes

* Updated README.md

* Added fallback in getIP in case the offline db is missing

* Fixed typos

* just md linting

* Removed vscode stuff

* Implemented fallback in getIP for PHP<8 (returns only the IP)

* Updated doc.md

* Fixed comments in telemetry_settings.php

* New quick start video

* Corrected image name in doc_docker.md

* Replaced speedtest with just test in stats.php

* docker documentation update

* typo

---------

Co-authored-by: Federico Dossena <info@fdossena.com>
Co-authored-by: Stefan Stidl <stefan.stidl@ffg.at>

Merge pull request #626 from librespeed/update-build-pipeline

add on publish trigger

Merge pull request #617 from zypA13510/revert-487-patch-1

fix: download speed is 0 on certain platform

Fixed vulnerability in json.php caused my missing Content-Type header