cannot automatically install requestor in linux on arm based cpu's

[krunch3r76]

people seeking to run a requestor on linux are advised to run the following command: curl -sSf https://join.golem.network/as-requestor | bash - requestor primer however for a client running the script in linux (not Darwin) on an arm cpu this fails with the error message: golem-installer: invalid cputype: aarch64

i propose additional bash logic #44 to test for aarch64 on requestor installs to proceed as normally (with an additional logic to correctly resolve the url to aarch64 binaries) following the canonical pattern set by the releases thus far.

closing this issue should also close #24 (in addition to #44)