New release build script (squashed)

.circleci/config.yml

bin/build-drivers/build_drivers/common.clj

bin/metabuild_common/core.clj

bin/metabuild_common/entrypoint.clj

bin/metabuild_common/env.clj

bin/metabuild_common/files.clj

bin/metabuild_common/input.clj

bin/metabuild_common/output.clj

bin/metabuild_common/shell.clj

bin/metabuild_common/steps.clj

bin/metabuild_common/util.clj

bin/release.sh

bin/release/README.md

bin/release/deps.edn

bin/release/release-template.md

bin/release/release.clj

bin/release/release/check_prereqs.clj

bin/release/release/common.clj

bin/release/release/common/github.clj

bin/release/release/common/hash.clj