build rpm packages

a hand on guide could be found here.

more detailed ref is rpm-packaging-guide

for the v8-riscv/v8 project, things are a little different: the source code are cross-compiled, and we just tar the binary files.

Steps:

1. clone the v8-riscv project and cross compiled using riscv-gnu-toolchain. you get d8 and snapshot_blob.bin.
2. create folders and spec file like v8-riscv-fedora
3. put the d8 and other new compiled files into the destination you want.
4. check the spec file, update release notes if you like.
5. run rpmbuild -bb d8.spec in the v8-riscv-fedora folder. you nay need yum install rpmdevtools to install rpm tools.

if you want publish

1. A good place is github release actions. you can download the rpm after the github Actions done.
2. Anyone could upload the rpm files to HTTP/FTP mirroring sites. You may need to create a sign-key to sign the files on the mirror site.