ci: add script to prune package.json for release

scripts/build-package.js

@@ -0,0 +1,26 @@
+const fs = require("node:fs");
+const path = require("node:path");
+
+const packagePath = path.join(process.cwd(), "package.json");
+const package = JSON.parse(fs.readFileSync(packagePath, "utf8"));
+
+const keys_to_remove = ["prettier", "standard-version", "devDependencies"];
+const scripts_to_keep = ["postinstall"];
+
+for (const key of keys_to_remove) {
+  delete package[key];
+}
+
+if (package.scripts) {
+  const preserved_scripts = {};
+
+  for (const script of scripts_to_keep) {
+    if (package.scripts[script]) {
+      preserved_scripts[script] = package.scripts[script];
+    }
+  }
+  
+  package.scripts = preserved_scripts;
+}
+
+fs.writeFileSync(packagePath, JSON.stringify(package, null, 2) + "\n");