run0: Add github action for building and unit testing

Using @MarcoPolo action-rs cargo fork until hopefully
actions-rs/cargo#59 gets merged.

Signed-off-by: Samuel Ortiz <s.ortiz@apple.com>

.github/workflows/run0.yaml

@@ -0,0 +1,54 @@
+name: run0 build and unit tests
+on: [push, pull_request, create]
+
+jobs:
+  basic_ci:
+    if: github.event_name == 'pull_request'
+    name: Check
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./run0
+    strategy:
+      fail-fast: false
+      matrix:
+        rust:
+          - stable
+          - beta
+          - nightly
+    steps:
+      - name: Code checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Install Rust toolchain (${{ matrix.rust }})
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+          components: rustfmt, clippy
+
+      - name: Build and install with default features
+        run: cargo build
+
+      - name: Run cargo test
+        uses: marcopolo/cargo@master
+        with:
+          working-directory: ./run0
+          command: test
+
+      - name: Run cargo fmt check
+        uses: marcopolo/cargo@master
+        with:
+          working-directory: ./run0
+          command: fmt
+          args: --all -- --check
+
+      - name: Run rust lint check
+        uses: marcopolo/cargo@master
+        with:
+          working-directory: ./run0
+          command: clippy
+          args: --all-targets --all-features -- -D warnings