Start splitting NDK out from the rest of the SDK

Author: marcprux

.github/workflows/pull_request.yml

@@ -44,9 +44,9 @@ jobs:
          # blank arch builds all (aarch64,x86_64,armv7)
          #arch: ['']
          # builds only x86_64 to speed up the validation
-         arch: ['x86_64']
+         #arch: ['x86_64']
          # build both the quick (x86_64) and complete (aarch64,x86_64,armv7) SDKs
-         #arch: ['x86_64', '']
+         arch: ['x86_64', '']
          swift-version: ['release', 'devel', 'trunk']
      runs-on: ubuntu-24.04
      steps: