Used to prefetch all required tarballs to build pyrogenesis later
without network access as is common for Linux package build and some
other CI environments.
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Usually not available in Linux Distributions as it isn't customary to
package the SDK but only the bits needed as separate packages.
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>