Build compiler playground as part of GitHub CI (take 2) (#4470)

Summary:
We reverted this in 6911daa because it was failing in CI. Can't repro locally, so trying again on GitHub to see what the error looks like.

Pull Request resolved: #4470

Reviewed By: tyao1

Differential Revision: D50383749

Pulled By: captbaritone

fbshipit-source-id: 57dff308c675af9a4b1622264c41edce27945401

.github/workflows/docusaurus.yml

@@ -11,17 +11,48 @@ on:
       - main
 
 jobs:
+  build-compiler-explorer:
+    name: Build Compiler Explorer
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.73.0 # We hit an LLVM error building Wasm on 1.72
+          override: true
+      - name: Install wasm-pack
+        run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+      - name: "Build Compiler Playground Wasm NPM package"
+        run: RUST_LOG=debug wasm-pack build --target web
+        working-directory: ./compiler/crates/relay-compiler-playground
+      - uses: actions/upload-artifact@v3
+        with:
+          name: compiler-playground-package
+          path: compiler/crates/relay-compiler-playground/pkg/
+
   build-and-deploy:
     runs-on: ubuntu-latest
+    needs: [build-compiler-explorer]
     steps:
       - name: Checkout
         uses: actions/checkout@v2.3.1
         with:
           persist-credentials: false
 
+      - name: Download Compiler Explorer
+        uses: actions/download-artifact@v2
+        with:
+          name: compiler-playground-package
+          path: tmp/compiler-playground-package
+
+      - name: Link Compiler Explorer
+        run: yarn link
+        working-directory: tmp/compiler-playground-package
+
       - name: Install and Build
         run: |
           yarn
+          yarn link relay-compiler-playground
           yarn build
         working-directory: website/