release.nix: Add a `distro.hello' job. * release.nix (distro.hello): New job.
release.nix: Pre-download the Guile bootstrap tarball. * release.nix (bootstrap_guile): New variable. (build)[preBuild]: New attribute.
release.nix: Set succeed-on-failure and build-out-source-tree. * release.nix: Define `succeedOnFailure', `keepBuildDirectory', and `buildOutOfSourceTree'. (build): Inherit them.
release.nix: Add dependency on GNU Texinfo. * release.nix (tarball)[buildNativeInputs]: Add `texinfo'.
release.nix: Add dependency on GNU libgcrypt. * release.nix (build)[configureFlags]: Add `--with-libgcrypt-prefix'.
release.nix: Build out of chroot. * release.nix: Add `preConfigure' and `__noChroot' attributes.
build: Add release.nix. * release.nix: New file. * Makefile.am (EXTRA_DIST): Add it.