bring over cross-deps

.github/workflows/cross-deps.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+set -e
+set -o pipefail
+
+# Install our deps.
+sudo apt update -y && sudo apt install -y \
+	ca-certificates \
+	clang \
+	cmake \
+	curl \
+	g++ \
+	gcc \
+	gcc-mingw-w64-i686 \
+	gcc-mingw-w64 \
+	jq \
+	libmpc-dev \
+	libmpfr-dev \
+	libgmp-dev \
+	libssl-dev \
+	libxml2-dev \
+	mingw-w64 \
+	wget \
+	zlib1g-dev
+
+# We need this for the version.
+cargo install toml-cli
+
+# Install cross.
+cargo install cross