Fix doc build.

.github/ci/doc.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+## on push branch=main
+
+set -euxo pipefail
+
+export RUSTUP_HOME=/ci/cache/rustup
+export CARGO_HOME=/ci/cache/cargo
+export CARGO_TARGET_DIR=/ci/cache/target
+export BUILDER_THREADS=4
+export BUILDER_COMPRESS=true
+
+# force rustup to download the toolchain before starting building.
+# Otherwise, the docs builder is running multiple instances of cargo rustdoc concurrently.
+# They all see the toolchain is not installed and try to install it in parallel
+# which makes rustup very sad
+rustc --version > /dev/null
+
+docserver-builder -i . -o webroot/crates/rp-pac/git.zup
+
+export KUBECONFIG=/ci/secrets/kubeconfig.yml
+POD=$(kubectl -n embassy get po -l app=docserver -o jsonpath={.items[0].metadata.name})
+kubectl cp webroot/crates $POD:/data

rust-toolchain.toml

@@ -0,0 +1,6 @@
+[toolchain]
+channel = "nightly-2024-09-06"
+targets = [
+    "thumbv6m-none-eabi",
+    "thumbv8m.main-none-eabihf",
+]