Add gdiff workflow support and install httpgd from GitHub with remotes #273
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…ackage and install gdiff
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This PR addresses issues #271 and #227 by enhancing the R development container setup to support the regression testing workflow using gdiff and by resolving the httpgd installation challenge using remotes.
Installed gdiff and its system dependencies (libmagick++-dev, libpoppler-cpp-dev) to enable graphical difference testing as outlined in Test and document gdiff workflow #271.
Configured dynamic r-universe Linux binary repositories in both Dockerfile and .Rprofile to speed up package installations and ensure compatibility with the container environment.
Installed httpgd from GitHub via remotes because it is not available on CRAN, resolving the issue described in httpgd package not currently on CRAN #227.
Added all required system libraries for httpgd to function correctly, including font rendering and graphics support dependencies.
Updated .Rprofile to include repository settings and optional VSCode integration for httpgd as the default graphics device to improve user experience.