cmd/dist: replace dist/release.sh

This is much more robust than a shell script.

Signed-off-by: Ophestra <cat@gensokyo.uk>

all.sh

@@ -0,0 +1,6 @@
+#!/bin/sh -e
+
+TOOLCHAIN_VERSION="$(go version)"
+cd "$(dirname -- "$0")/"
+echo "# Building cmd/dist using ${TOOLCHAIN_VERSION}."
+go run -v --tags=dist ./cmd/dist