dev: add a script to update Zig version used by CI

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

dev/update-zig.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+set -euo pipefail
+cd "$(dirname "${BASH_SOURCE[0]}")"/..
+
+update_zig() {
+    gsed -i 's|\(https://ziglang.org/builds/zig-[^/ -]*-[^/ -]*-\)[^/ ]*\(\(\.tar\.xz\)[^/ ]*\)|\1'"$1"'\2|' $2
+    gsed -i 's|\(https://ziglang.org/builds/zig-[^/ -]*-[^/ -]*-\)[^/ ]*\(\(\.zip\)[^/ ]*\)|\1'"$1"'\2|' $2
+}
+
+if [ -n "${ZIG_VERSION:-}" ]; then
+    version="${ZIG_VERSION:-}"
+
+    sources=$(find . | grep './.github/workflows' | grep -v 'third_party/' | grep -v 'DirectXShaderCompiler' | grep -v '/libs/' | grep '\.yml')
+    echo "$sources" | while read line ; do update_zig "$version" "$line" ; done
+
+    update_zig "$version" README.md
+else
+    echo "must specify e.g. ZIG_VERSION=0.10.0-dev.2017+a0a2ce92c"
+    exit 0
+fi