re-add update.sh

pkgs/by-name/ta/tailwindcss_4/update.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl gnused jq nix-prefetch
+set -eou pipefail
+
+ROOT="$(dirname "$(readlink -f "$0")")"
+
+CURRENT_VERSION=$(nix-instantiate --eval --strict --json -A tailwindcss.version . | jq -r .)
+LATEST_VERSION=$(curl --fail --silent https://api.github.com/repos/tailwindlabs/tailwindcss/releases/latest | jq --raw-output .tag_name | sed 's/v//')
+sed -i "s/version = \".*\"/version = \"${LATEST_VERSION}\"/" "$ROOT/default.nix"
+
+if [ "$CURRENT_VERSION" = "$LATEST_VERSION" ]; then
+    echo "tailwindcss already at latest version $CURRENT_VERSION, exiting"
+    exit 0
+fi
+
+function updatePlatform() {
+    NIXPLAT=$1
+    TAILWINDPLAT=$2
+    echo "Updating tailwindcss for $NIXPLAT"
+
+    URL="https://github.com/tailwindlabs/tailwindcss/releases/download/v${LATEST_VERSION}/tailwindcss-${TAILWINDPLAT}"
+    HASH=$(nix hash to-sri --type sha256 "$(nix-prefetch-url --type sha256 "$URL")")
+
+    sed -i "s,$NIXPLAT = \"sha256.*\",$NIXPLAT = \"${HASH}\"," "$ROOT/default.nix"
+}
+
+updatePlatform aarch64-darwin macos-arm64
+updatePlatform aarch64-linux linux-arm64
+updatePlatform x86_64-darwin macos-x64
+updatePlatform x86_64-linux linux-x64