Add Cross.toml

Cross.toml

@@ -0,0 +1,3 @@
+[build]
+pre-build = "./scripts/cross/pre-build-script.sh"
+env.passthrough = ["BUF_CACHE_DIR=/tmp"]

scripts/cross/pre-build-script.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+
+set -eu
+
+TARGET=${1}
+
+BUF_VERSION=1.47.2
+PROTOC_VERSION=25.1
+
+ARCH=$(echo "$TARGET" | cut -d "-" -f 1)
+
+echo "ARCH=$ARCH"
+
+PROTOC_ARCH=$ARCH
+
+if [ $ARCH = "aarch64" ]; then
+    # For some reason protobuf is using this weird naming for ARM
+    PROTOC_ARCH=aarch_64
+fi
+
+echo "PROTOC_ARCH=$PROTOC_ARCH"
+
+export DEBIAN_FRONTEND=noninteractive
+
+dpkg --add-architecture $CROSS_DEB_ARCH
+
+apt-get update
+apt-get install -y \
+    openssl \
+    ca-certificates \
+    pkg-config \
+    cmake \
+    libssl-dev:$CROSS_DEB_ARCH \
+    curl \
+    unzip
+
+curl -sSL -o /usr/local/bin/buf "https://github.com/bufbuild/buf/releases/download/v${BUF_VERSION}/buf-Linux-${ARCH}"
+chmod +x /usr/local/bin/buf
+
+curl -sSL -o /tmp/protoc.zip "https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-${PROTOC_ARCH}.zip"
+unzip /tmp/protoc.zip -d /usr/local