Files
runc/script
Kir Kolyshkin f30244ee1b make release: add cross-build
This implements cross-build for "make release", moving the build into a
container. This way we can support arm, arm64, ppc, and whatnot.

* script/seccomp.sh: separate out of script/release.sh, amend to support
  cross-compile and save needed environment variables to a file.

* Dockerfile: add installing libseccomp from source, as this is needed
  for release builds.

* script/release.sh: amend to support more architectures in addition to
  the native build. Additional arches can be added by specifying
  "-a <arch>" argument (can be specified multiple times), or
  "make RELEASE_ARGS="-a arm64" release" if called via make.
  All supported architectures can be enabled via "make releaseall".

* Makefile: move "release" target to "localrelease", add "release" and
  "releaseall" targets to build via the Dockerfile. This is done because
  most distros (including Fedora and openSUSE) lack cross-glibc, which is
  needed to cross-compile libseccomp.

* Makefile: remove 'cross' and 'localcross' targets, as this is now done
  by the release script.

* .github/workflows/validate.yum: amend the release CI job to cross-build
  for supported architectures, remove cross job.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
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..
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