Try

Author: grovesNL

.github/workflows/ci.yml

@@ -9,7 +9,8 @@ on:
 jobs:
   build:
     runs-on: ${{ matrix.os }}
-    env: ${{ matrix.env }}
+    env:
+      RUSTFLAGS: ${{ matrix.RUSTFLAGS }}
     strategy:
       matrix:
         os: [macos-10.15, ubuntu-18.04, windows-2019]
@@ -30,8 +31,7 @@ jobs:
           - wasm: true
             CHECK_COMMAND: rustup default wasm32-unknown-unknown && cargo check --all-targets
             TEST_COMMAND: rustup default wasm32-unknown-unknown && cargo test --all-targets --no-run
-            env:
-              RUSTFLAGS: --cfg=web_sys_unstable_apis
+            RUSTFLAGS: --cfg=web_sys_unstable_apis
     steps:
     - uses: actions/checkout@v2
     - name: cargo check