Add a nightly release build GH Action

.github/workflows/nightly.yml

@@ -0,0 +1,70 @@
+on:  
+  schedule:
+    - cron:  '0 0 * * *'
+
+name: Nightly Release Build
+
+jobs:
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Install LLVM
+        run: sudo ./ci/install-llvm.sh 8
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        name: update cargo (needed for Inkwell)
+        with:
+          command: update
+      - uses: actions-rs/cargo@v1
+        name: cargo test
+        with:
+          command: test --release
+
+  juild:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        name: update cargo (needed for Inkwell)
+        with:
+          command: update
+      - uses: actions-rs/cargo@v1
+        name: cargo build
+        with:
+          command: build --release
+
+  # clippy:
+  #   name: Clippy
+  #   runs-on: ubuntu-latest
+  #   steps:
+  #     - uses: actions/checkout@v1
+  #     - name: Install LLVM
+  #       run: sudo ./ci/install-llvm.sh 8
+  #     - uses: actions-rs/toolchain@v1
+  #       with:
+  #         profile: minimal
+  #         toolchain: stable
+  #         override: true
+  #     - run: rustup component add clippy
+  #     - uses: actions-rs/cargo@v1
+  #       name: update cargo (needed for Inkwell)
+  #       with:
+  #         command: update
+  #     - uses: actions-rs/cargo@v1
+  #       name: cargo clippy
+  #       with:
+  #         command: clippy
+  #         args: --release -- -D warnings