ci: initial backend vite config

vite.config.js

@@ -0,0 +1,47 @@
+import { defineConfig } from "vite";
+import optimizer from "vite-plugin-optimizer";
+import { nodePolyfills } from "vite-plugin-node-polyfills";
+import { resolve } from "path";
+
+const config = {};
+
+const currentConfig = config[process.env.LIB_NAME];
+if (currentConfig === undefined) {
+  throw new Error("LIB_NAME is not defined or is not valid");
+}
+
+["background", "bootloader", "bridge", "crypto", "cryptoLoader"].forEach(
+  (item) => {
+    config[item] = {
+      entry: resolve(__dirname, `./src/main/${item}.ts`),
+      fileName: "math.js",
+    };
+  },
+);
+
+export default defineConfig({
+  build: {
+    outDir: "lib",
+    lib: {
+      entry: "build/index.js",
+      name: "main",
+      formats: ["cjs"],
+      ...currentConfig,
+    },
+    minify: false,
+    rollupOptions: { output: { inlineDynamicImports: true } },
+  },
+  resolve: {
+    dedupe: ["@lumeweb/libportal", "@lumeweb/libweb", "@lumeweb/libkernel"],
+  },
+  plugins: [
+    optimizer({
+      "node-fetch":
+        "const e = undefined; export default e;export {e as Response, e as FormData, e as Blob};",
+    }),
+    nodePolyfills({
+      exclude: ["fs"],
+      globals: { Buffer: true, global: true, process: true },
+    }),
+  ],
+});