Refactor environment variable management and streamline build process

- Introduced a new Env utility class to manage environment variables and flavors, replacing deprecated imports.
- Updated build commands for iOS and Android to utilize the new environment management system.
- Enhanced GitHub Actions workflows by adding steps for extracting and decoding Dotenv variables from GitHub secrets.
- Removed outdated workflows and ensured compatibility with the latest dependency versions.

These changes improve the project's structure, maintainability, and build efficiency.

scripts/app-store-connect-api-key.ts

@@ -0,0 +1,26 @@
+import { sign } from "jsonwebtoken";
+import fs from "node:fs";
+const env = {
+  keyId: "4LQFA4R675",
+  issuerId: "fd4cca56-716b-4f03-8e44-de72a03453db",
+};
+const header = {
+  alg: "ES256",
+  typ: "JWT",
+  kid: env.keyId,
+} as const;
+
+const jwt = sign(
+  {
+    iss: env.issuerId,
+    aud: "appstoreconnect-v1",
+  },
+  fs.readFileSync("AuthKey.p8"),
+  {
+    header,
+    algorithm: "ES256",
+    expiresIn: "2m",
+  }
+);
+
+console.log(jwt);