chore: build with nx (#271)

Enables Nx builds in CI workflows. This will parallelize package
building and greatly reduce build times.

What a wonderful world.

---
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Author: mrgrain

.github/workflows/build.yml

@@ -199,6 +199,7 @@ const repoProject = new yarn.Monorepo({
     includeRootWorkspace: true,
   },
   nx: true,
+  buildWithNx: true,
 
   eslintOptions: {
     dirs: ['lib'],