Add nightly CI

Author: rmja

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ on:
 name: Continuous integration
 
 jobs:
-  ci:
+  ci-stable:
     runs-on: ubuntu-latest
     strategy:
       matrix:
@@ -28,3 +28,23 @@ jobs:
         with:
           command: check
           args: --target=${{ matrix.target }} --examples
+  ci-nightly:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target:
+          - thumbv6m-none-eabi
+          - thumbv7m-none-eabi
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          target: ${{ matrix.target }}
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --target=${{ matrix.target }} --examples --features allocator_api