illumos: add CI using Buildomat

.github/buildomat/README.md

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+# Buildomat CI
+
+For builds on illumos, we use Oxide Computer's [Buildomat CI](https://github.com/oxidecomputer/buildomat).
+
+Compute resources for CI are provided by Oxide Computer.

.github/buildomat/build-and-test.sh

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+#!/bin/env bash
+
+set -o errexit
+set -o pipefail
+set -o xtrace
+
+# Enable ANSI colors in Cargo output.
+export CARGO_TERM_COLOR=always
+
+cargo --version
+rustc --version
+
+banner libc
+ptime -m cargo build --verbose
+
+banner test
+ptime -m cargo test --verbose
+
+banner libctest
+ptime -m cargo test --verbose --manifest-path libc-test/Cargo.toml

.github/buildomat/config.toml

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+# Configuration for buildomat. See
+# https://github.com/oxidecomputer/buildomat?tab=readme-ov-file#per-repository-configuration.
+
+enable = true
+# The buildomat jobs don't have access to any secrets, so it's okay for GitHub
+# users to create them.
+org_only = false

.github/buildomat/jobs/x86_64-unknown-illumos.sh

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+#!/bin/env bash
+#:
+#: name = "x86_64-unknown-illumos"
+#: variety = "basic"
+#: target = "helios-latest"
+#: rust_toolchain = "stable"
+
+exec .github/buildomat/build-and-test.sh illumos