Update/dynamic url

[StarTrooper08]

Pull request for issue number #227

[StarTrooper08]

hari08@pop-os:~$ docker run -it r-devel-image:latest bash
root ➜ / $ R

R version 4.5.0 (2025-04-11) -- "How About a Twenty-Six"
Copyright (C) 2025 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> "HTTPgd" %in% rownames(installed.packages())
[1] FALSE
> "httpgd" %in% rownames(installed.packages())
[1] TRUE
> 

[StarTrooper08]

The dockerfile now has latest ubuntu devcontainer base image and httpgd installed from r-universe