ci: test no_std build

.github/workflows/main.yml

@@ -18,3 +18,19 @@ jobs:
       with:
         command: test
         args: --all-features
+  build_no_std:
+    name: build with no_std
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3.0.2
+    - uses: actions-rs/toolchain@v1.0.7
+      with:
+        toolchain: stable
+        override: true
+        # This does not support std, so we use to test if no_std works
+        target: thumbv6m-none-eabi
+    - uses: actions-rs/cargo@v1.0.3
+      with:
+        command: build
+        # Disables std feature
+        args: --no-default-features --target thumbv6m-none-eabi