Add feature builds to CI

Build with default features, no features and all features enabled.

Author: Marcin Radomski

.github/workflows/ci.yml

@@ -26,6 +26,10 @@ jobs:
           - armv7-linux-androideabi
           - aarch64-linux-android
           - i686-linux-android
+        features:
+          - ""
+          - --no-default-features
+          - --all-features
 
     steps:
       - uses: actions/checkout@v3
@@ -35,8 +39,8 @@ jobs:
           toolchain: ${{ matrix.toolchain }}
           target: ${{ matrix.target }}
 
-      - run: cargo build --target=${{ matrix.target }}
-      - run: cargo doc --target=${{ matrix.target }}
+      - run: cargo build --target=${{ matrix.target }} ${{ matrix.features }}
+      - run: cargo doc --target=${{ matrix.target }} ${{ matrix.features }}
       # Temporary test non-target only.
       # TODO: Test in emulator or something.
       - run: cargo test