For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:firstyear:branches:devel:languages:rust/openSUSE_Tumbleweed/home:firstyear:branches:devel:languages:rust.repo
zypper refresh
zypper install sccache
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:firstyear:branches:devel:languages:rust/openSUSE_Factory_ARM/home:firstyear:branches:devel:languages:rust.repo
zypper refresh
zypper install sccache
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:firstyear:branches:devel:languages:rust/15.6/home:firstyear:branches:devel:languages:rust.repo
zypper refresh
zypper install sccache