github: add run step for no-std

Signed-off-by: Fintan Halpenny <fintan.halpenny@gmail.com>
X-Clacks-Overhead: GNU Terry Pratchett

Author: FintanH

.github/workflows/actions.yml

@@ -21,6 +21,20 @@ jobs:
           RUSTFLAGS: -D warnings
       - name: Run tests
         run: cargo test --all --verbose --features serialize,arbitrary
+  no-std:
+    name: no-std build  and test
+    strategy:
+      matrix:
+        os: ['ubuntu-latest', 'macos-latest']
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build
+        run: cargo build --verbose --no-default-features
+        env:
+          RUSTFLAGS: -D warnings
+      - name: Run tests
+        run: cargo test --all --verbose --no-default-features
 
   rustfmt_and_clippy:
     name: Check rustfmt style && run clippy