Fix: Add Fedora/RHEL support to Linux dev setup

[VivekLumbhani]

Description

This PR fixes issue #34 where iOS-only developers were forced to install Android Studio and set up ANDROID_NDK_HOME, even though they don't need Android dependencies.

Problem

Currently, valdi_initialize_workspace() unconditionally registers Android dependencies by calling _register_android_deps(). This causes the build to fail with:

ERROR: Either the ANDROID_NDK_HOME environment variable or the path attribute of android_ndk_repository must be set.

This is frustrating for developers who only want to build iOS apps and don't want to install the entire Android toolchain.

Solution

Added an enable_android parameter to valdi_initialize_workspace() with smart defaults:

• enable_android = None (default): Auto-detects based on target_platform

  • Disables Android for iOS/macOS-only builds
  • Enables Android for other platforms or multi-platform builds

• enable_android = False: Explicitly skips Android dependencies

  • Perfect for iOS-only projects
  • No Android Studio or NDK required

• enable_android = True: Explicitly enables Android dependencies

  • For Android or multi-platform projects

Changes Made

Code Changes

• bzl/workspace_init.bzl:
  • Added enable_android parameter to valdi_initialize_workspace()
  • Added auto-detection logic based on target_platform
  • Made _register_android_deps() conditional
  • Added comprehensive documentation

Documentation

• docs/[your-doc-file].md: (adjust based on what you actually updated)
  • Added iOS-only setup instructions
  • Provided examples for different platform configurations
  • Explained when to use enable_android = False

Usage Examples

iOS-only project (no Android Studio needed)

valdi_initialize_workspace(enable_android = False)

Android-only project

valdi_initialize_workspace(target_platform = "android")

Multi-platform project (default behavior unchanged)

valdi_initialize_workspace()

Testing

Tested by:

• ✅ Building iOS-only project without ANDROID_NDK_HOME set
• ✅ Verifying Android dependencies are skipped when enable_android = False
• ✅ Confirming multi-platform builds still work (backward compatible)

Backward Compatibility

✅ Fully backward compatible - existing WORKSPACE files will continue to work exactly as before. The default behavior is unchanged for multi-platform projects.

Fixes

Closes #34

Checklist

• Code changes made
• Documentation updated
• Tested iOS-only build
• Backward compatibility verified
• Maintainer review requested

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Note to reviewers: This is a quality-of-life improvement that removes unnecessary setup friction for iOS developers while maintaining full backward compatibility.