ci: add quick-check with rustfmt (#615)

* ci: add quick-check with clippy and rustfmt

* chore: rustfmt round

* chore: set the same rustfmt config than substrate

* chore: fix formatting

* cI: remove clippy

* ci: switch to nightly for the checks

* ci: fix toolchains and naming

* ci: Limit the check to formatting

* chore: fix formatting

* Update .rustfmt.toml

* Update .rustfmt.toml

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

.github/workflows/quick-check.yml

@@ -0,0 +1,40 @@
+name: Quick check Formatting
+
+on:
+  push:
+    branches:
+      - "*"
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  quick_check:
+    strategy:
+      matrix:
+        os: ["ubuntu-latest"]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Install Rust nightly toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+          override: true
+          components: clippy, rustfmt
+
+      - name: Cache Dependencies & Build Outputs
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-${{ matrix.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
+      - uses: actions/checkout@v2
+
+      - name: Cargo fmt
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check