[buildomat] Job to create Helios image (#2500)

- Depends on #2475
- Ingests global zone packages, and places them in the ramdisk
- Output of job: Helios image, which should be bootable on a Gimlet

Author: smklein

.github/buildomat/jobs/host-image.sh

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+#!/bin/bash
+#:
+#: name = "helios / build OS image"
+#: variety = "basic"
+#: target = "helios-latest"
+#: rust_toolchain = "1.66.1"
+#: output_rules = [
+#:	"=/work/helios/image/output/zfs.img",
+#:	"=/work/helios/image/output/rom",
+#: ]
+#: access_repos = [
+#:	"oxidecomputer/amd-apcb",
+#:	"oxidecomputer/amd-efs",
+#:	"oxidecomputer/amd-firmware",
+#:	"oxidecomputer/amd-flash",
+#:	"oxidecomputer/amd-host-image-builder",
+#:	"oxidecomputer/boot-image-tools",
+#:	"oxidecomputer/boot-image-tools",
+#:	"oxidecomputer/chelsio-t6-roms",
+#:	"oxidecomputer/compliance-pilot",
+#:	"oxidecomputer/facade",
+#:	"oxidecomputer/helios",
+#:	"oxidecomputer/helios-omnios-build",
+#:	"oxidecomputer/helios-omnios-extra",
+#:	"oxidecomputer/nanobl-rs",
+#: ]
+#:
+#: [dependencies.package]
+#: job = "helios / package"
+#:
+
+set -o errexit
+set -o pipefail
+set -o xtrace
+
+cargo --version
+rustc --version
+
+source "$(pwd)/tools/helios_version"
+
+#
+# The token authentication mechanism that affords us access to other private
+# repositories requires that we use HTTPS URLs for GitHub, rather than SSH.
+#
+override_urls=(
+    'git://github.com/'
+    '[email protected]:'
+    'ssh://github.com/'
+    'ssh://[email protected]/'
+    'git+ssh://[email protected]/'
+)
+for (( i = 0; i < ${#override_urls[@]}; i++ )); do
+	git config --add --global url.https://github.com/.insteadOf \
+	    "${override_urls[$i]}"
+done
+
+#
+# Require that cargo use the git CLI instead of the built-in support.  This
+# achieves two things: first, SSH URLs should be transformed on fetch without
+# requiring Cargo.toml rewriting, which is especially difficult in transitive
+# dependencies; second, Cargo does not seem willing on its own to look in
+# ~/.netrc and find the temporary token that buildomat generates for our job,
+# so we must use git which uses curl.
+#
+export CARGO_NET_GIT_FETCH_WITH_CLI=true
+
+pfexec mkdir -p /work
+cd /work
+
+# /work/gz: Global Zone artifacts to be placed in the Helios image.
+mkdir gz && cd gz
+ptime -m tar xvzf /input/package/work/global-zone-packages.tar.gz
+cd -
+
+# TODO: Consider importing zones here too?
+
+# Checkout helios at a pinned commit
+git clone https://github.com/oxidecomputer/helios.git
+cd helios
+
+git checkout "$COMMIT"
+
+# Create the "./helios-build" command, which lets us build images
+gmake setup
+
+# Commands that "./helios-build" would ask us to run (either explicitly
+# or implicitly, to avoid an error).
+pfexec pkg install /system/zones/brand/omicron1/tools
+pfexec zfs create -p rpool/images/build
+
+./helios-build experiment-image \
+	-p helios-netdev=https://pkg.oxide.computer/helios-netdev \
+	-F optever=0.21 \
+	-P /work/gz/root \
+	-B

tools/helios_version

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+COMMIT=49d501d2f37060e29a84a50e9026860315975794