I managed to create a custom task in the build template after some searching for the variables I finally could create a custom task that created the correct folders and located the files that needed to be brought along in the build.
To find the variables I used the common task GetEnvironmentVariable with the specified variables. To see what each variable contained I added a print line just afterwards and tried the build and then when I had found the needed sources of information the task to create a custom build task was fairly easy.