fix: disable RPM post-install scripts for cross-compilation

[utkarsh232005]

Problem

The Generate Packages job in the release workflow fails when building the aarch64 RPM package on an x86_64 Ubuntu runner:

/usr/bin/strip: Unable to recognise the format of the input file
`/home/runner/.../kdc`
error: Bad exit status from /var/tmp/rpm-tmp.KriFDN (%install)

This happens because rpmbuild automatically runs brp-strip (binary stripping) as part of the %install phase. When cross-compiling, the native x86_64 strip tool cannot process aarch64 binaries.

Fix

Add %global __os_install_post %{nil} to the RPM spec template to disable all automatic post-install processing scripts, including:

• brp-strip (binary stripping)
• brp-compress (man page compression)
• brp-elfperms (ELF permission fixes)

This is safe because:

• Rust already produces optimized release binaries (cargo build --release)
• The binary doesn't need additional stripping or post-processing
• We're packaging a single static binary with no man pages or additional files

Result

Both x86_64 and aarch64 RPM packages build successfully on the x86_64 GitHub Actions runner.

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