build: run tests natively on ARM, Mac, and Windows in CI (#111)

scripts/ci/install-go.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+set -eo pipefail
+
+declare -r GO_VERSION=1.16.5
+
+function install_go_linux () {
+    ARCHIVE=go${GO_VERSION}.linux-$(dpkg --print-architecture).tar.gz
+    wget https://golang.org/dl/${ARCHIVE}
+    tar -C $1 -xzf ${ARCHIVE}
+    rm ${ARCHIVE}
+}
+
+function install_go_mac () {
+    ARCHIVE=go${GO_VERSION}.darwin-amd64.tar.gz
+    wget https://golang.org/dl/${ARCHIVE}
+    tar -C $1 -xzf ${ARCHIVE}
+    rm ${ARCHIVE}
+}
+
+function install_go_windows () {
+    ARCHIVE=go${GO_VERSION}.windows-amd64.zip
+    wget https://golang.org/dl/${ARCHIVE}
+    unzip -qq -d $1 ${ARCHIVE}
+    rm ${ARCHIVE}
+}
+
+function main () {
+    if [[ $# != 1 ]]; then
+        >&2 echo Usage: $0 '<install-dir>'
+        exit 1
+    fi
+    local -r install_dir=$1
+
+    rm -rf "$install_dir"
+    mkdir -p "$install_dir"
+    case $(uname) in
+        Linux)
+            install_go_linux "$install_dir"
+            ;;
+        Darwin)
+            install_go_mac "$install_dir"
+            ;;
+        MSYS_NT*)
+            install_go_windows "$install_dir"
+            ;;
+        *)
+            >&2 echo Error: unknown OS $(uname)
+            exit 1
+            ;;
+    esac
+
+    "${install_dir}/go/bin/go" version
+}
+
+main ${@}

scripts/ci/setup-system.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -eo pipefail
+
+function setup_linux () {
+    sudo apt-get update
+    sudo apt-get install -y --no-install-recommends make
+}
+
+function setup_mac () {
+    # Python and TCL both come pre-installed on Circle's mac executors, and both depend on wget in some way.
+    # Homebrew will auto-upgrade both of them when wget is installed/upgraded, triggering a chain of upgrades.
+    # Uninstall them both before adding wget to avoid burning time in CI for things we don't need.
+    brew remove --force python@3.9 tcl-tk
+    HOMEBREW_NO_AUTO_UPDATE=1 brew install wget
+}
+
+function setup_windows () {
+    choco install make mingw wget
+}
+
+function main () {
+    case $(uname) in
+        Linux)
+            setup_linux
+            ;;
+        Darwin)
+            setup_mac
+            ;;
+        MSYS_NT*)
+            setup_windows
+            ;;
+        *)
+            >&2 echo Error: unknown OS $(uname)
+            exit 1
+            ;;
+    esac
+}
+
+main ${@}