[CI] fix fmt job with nightly

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ on:
     tags:
       - '[0-9]+.[0-9]+.[0-9]+*'
   pull_request:
-    branches: [master]
+    branches: [ master ]
   workflow_dispatch:
     inputs:
       verbose:
@@ -34,9 +34,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-20.04]
-        rust: [stable]
-        binary: [release]
+        os: [ ubuntu-20.04 ]
+        rust: [ stable ]
+        binary: [ release ]
     env:
       RUST_BACKTRACE: full
       RUSTV: ${{ matrix.rust }}
@@ -72,43 +72,22 @@ jobs:
           name: encointer-collator-${{ github.sha }}
           path: target/release/encointer-collator
 
-
-  # Run all checks and unit test. This always run on debug mode
-  check:
-    name: Rust check ${{ matrix.check }} (${{ matrix.rust-target }})
-    runs-on: ${{ matrix.os }}
+  fmt:
+    name: cargo fmt
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        os: [ubuntu-latest]
-        rust: [stable]
-        rust-target: [x86_64-unknown-linux-gnu]
-        check: [fmt] # ignore clippy for now
+        rust: [ nightly ]
+        rust-target: [ x86_64-unknown-linux-gnu ]
     env:
       RUST_BACKTRACE: full
       RUSTV: ${{ matrix.rust }}
       TARGET: ${{ matrix.rust-target }}
     steps:
       - uses: actions/checkout@v3
 
-      - name: Install protoc
-        run: sudo apt-get install protobuf-compiler
-
-      # With rustup's nice new toml format, we just need to run rustup show to install the toolchain
-      # https://github.com/actions-rs/toolchain/issues/126#issuecomment-782989659
-      - name: Setup Rust toolchain
-        run: rustup show
-
-      - uses: Swatinem/rust-cache@v2
-        with:
-          key: ${{ matrix.rust-target }}-${{ matrix.check }}
-
       - name: Fmt
-        if: ${{ matrix.check == 'fmt' }}
-        run: cargo fmt --all -- --check
-
-      - name: Clippy
-        if: ${{ matrix.check == 'clippy' }}
-        run: cargo clippy -- -D warnings
+        run: cargo +nightly fmt --all
 
   cargo-toml-fmt:
     runs-on: ubuntu-latest
@@ -172,7 +151,7 @@ jobs:
     name: Draft Release
     if: startsWith(github.ref, 'refs/tags/')
     runs-on: ubuntu-latest
-    needs: [create_artifacts, build_primary_binaries, check]
+    needs: [ create_artifacts, build_primary_binaries, check ]
     outputs:
       release_url: ${{ steps.create-release.outputs.html_url }}
       asset_upload_url: ${{ steps.create-release.outputs.upload_url }}