Backport ci: make parallel jobs on arm (#813)

[kenhys]

follow-up #809

In this PR, I've found apt-arm executes duplicated binstubs test.

[kenhys]

NOTE: test failed with on AlmaLinux 9.

gzip: stdin: unexpected end of file
tar: Child returned status 1
tar: Error is not recoverable: exiting now
/usr/lib/rpmrebuild/rpmrebuild.sh: ERROR: (RpmUnpack) rpm2archive
/usr/lib/rpmrebuild/rpmrebuild.sh: ERROR: (CreateBuildRoot) RpmUnpack
/usr/lib/rpmrebuild/rpmrebuild.sh: ERROR: CreateBuildRoot

This is caused by rpm2archive | tar -xz ... failure.

[kenhys]

rpm -qf /usr/bin/rpm2archive 
rpm-4.16.1.3-34.el9.x86_64

rpm itself is not changed recently.

[kenhys]

rpm2archive generates an archive, so RpmUnpack function in /usr/lib/rpmrebuild/rpmrebuild.sh will not work.
It assume that rpm2archive generates tgz output, then pipe it to tar command.

if [ -n "$tst_rpm2archive" ]
        then
                Debug '(RpmUnpack) rpm2archive'
                rpm2archive ${RPMREBUILD_PAQUET} | tar -xz -C $BUILDROOT || Error "(RpmUnpack) rpm2archive" || return
        else

Thus, something like the following behavior is expected, but actually not.

HOME=/tmp cat ./fluent-package-5.2.0-1.el9.x86_64.rpm.tgz | tar -xz -C /tmp/root

[kenhys]

rpmrebuild 2.20-3 seems buggy, in rpmrebuild 2.16 era, it uses rpm2cpio.

[kenhys]

Already reported:

#18 rpmrebuild 2.20: rpm2archive called with incorrect arguments
https://sourceforge.net/p/rpmrebuild/bugs/18/

[daipom]

Thanks!