split build for browser tests entirely

.github/workflows/test_web.yml

@@ -97,17 +97,62 @@ jobs:
         working-directory: web
         run: npm test
 
+  build-for-browser-tests:
+    needs: changes
+    if: needs.changes.outputs.should_run == 'true'
+    name: Build for browser tests
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+          cache-dependency-path: web/package-lock.json
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+
+      - name: Cache Cargo output
+        uses: Swatinem/rust-cache@v2
+        with:
+          shared-key: "web"
+          save-if: false
+
+      # wasm-bindgen-cli version must match wasm-bindgen crate version.
+      # Be sure to update in release_nightly.yml, Cargo.toml, web/docker/Dockerfile,
+      # and web/README.md as well.
+      - name: Install wasm-bindgen
+        run: cargo install wasm-bindgen-cli --version 0.2.93
+
+      # No real need to install wasm-opt here
+
+      - name: Build selfhosted
+        env:
+          RUSTFLAGS: -D warnings
+          # Verify that all features build.
+          CARGO_FLAGS: --all-features
+        working-directory: web
+        shell: bash -l {0}
+        run: |
+          npm ci
+          npm run build --workspace=ruffle-core
+          npm run build --workspace=ruffle-selfhosted
+
       - name: Upload artifacts
-        if: matrix.os == 'ubuntu-24.04' && matrix.node_version == '22'
         uses: actions/upload-artifact@v4
         with:
           name: selfhosted-dist
           path: web/packages/selfhosted/dist
 
+
   browser-tests:
-    # Only the instance that uploads the artifact is really needed, but there's no way to express that.
-    # See: https://github.com/orgs/community/discussions/42335
-    needs: build
+    needs: build-for-browser-tests
     if: needs.changes.outputs.should_run == 'true'
     name: Test in ${{ matrix.browser }}
     runs-on: ubuntu-24.04
@@ -126,7 +171,7 @@ jobs:
           cache: npm
           cache-dependency-path: web/package-lock.json
 
-      - name: Download artifacts
+      - name: Download artifact
         uses: actions/download-artifact@v4
         with:
           name: selfhosted-dist