Hmm ... It's impossible ;-) This RPM doesn't exist on any FTP server

Provides :
flatpak-builder
flatpak-builder(x86-32)

Requires :

/usr/bin/appstreamcli
/usr/bin/bzip2
/usr/bin/eu-strip
/usr/bin/git
/usr/bin/patch
/usr/bin/strip
/usr/bin/tar
/usr/bin/unzip
AppStream-compose
debugedit
flatpak >= 1.15.6
libc.so.6
libc.so.6(GLIBC_2.0)
libc.so.6(GLIBC_2.1)
libc.so.6(GLIBC_2.1.3)
libc.so.6(GLIBC_2.2)
libc.so.6(GLIBC_2.27)
libc.so.6(GLIBC_2.28)
libc.so.6(GLIBC_2.3)
libc.so.6(GLIBC_2.3.4)
libc.so.6(GLIBC_2.33)
libc.so.6(GLIBC_2.34)
libc.so.6(GLIBC_2.38)
libc.so.6(GLIBC_2.4)
libc.so.6(GLIBC_2.6)
libc.so.6(GLIBC_2.9)
libcurl.so.4
libelf.so.1
libelf.so.1(ELFUTILS_1.0)
libgio-2.0.so.0
libglib-2.0.so.0
libgobject-2.0.so.0
libjson-glib-1.0.so.0
libjson-glib-1.0.so.0(libjson-glib-1.0.so.0)
libostree-1.so.1
libostree-1.so.1(LIBOSTREE_2016.3)
libostree-1.so.1(LIBOSTREE_2016.8)
libostree-1.so.1(LIBOSTREE_2018.6)
libxml2.so.2
libxml2.so.2(LIBXML2_2.4.30)
libxml2.so.2(LIBXML2_2.6.0)
libyaml-0.so.2
rpmlib(CompressedFileNames) <= 3.0.4-1
rpmlib(FileDigests) <= 4.6.0-1
rpmlib(PayloadFilesHavePrefix) <= 4.0-1
rpmlib(PayloadIsZstd) <= 5.4.18-1

Content of RPM :
/usr/bin/flatpak-builder
/usr/share/doc/flatpak-builder
/usr/share/doc/flatpak-builder/docbook.css
/usr/share/doc/flatpak-builder/flatpak-builder-docs.html
/usr/share/doc/packages/flatpak-builder
/usr/share/doc/packages/flatpak-builder/NEWS
/usr/share/doc/packages/flatpak-builder/README.md
/usr/share/licenses/flatpak-builder
/usr/share/licenses/flatpak-builder/COPYING
/usr/share/man/man1/flatpak-builder.1.gz
/usr/share/man/man5/flatpak-manifest.5.gz