ci: add rustfmt.toml and remove rustfmt config from ci

.github/workflows/lint-and-test.yml

@@ -182,19 +182,19 @@ jobs:
       #   files: lcov.info
       #   fail_ci_if_error: true
 
-  # Run cargo fmt --all -- --config imports_granularity=Crate,group_imports=One --check
+  # Run cargo fmt --all -- --check
   format:
     name: Format
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
         uses: actions/checkout@v3
-      - name: Install stable toolchain
+      - name: Install nightly toolchain
         run: |
-          curl https://sh.rustup.rs -sSf | bash -s -- -y --profile minimal && source ~/.cargo/env
+          curl https://sh.rustup.rs -sSf | bash -s -- -y --profile minimal && source ~/.cargo/env && rustup default nightly
           rustup component add rustfmt
       - name: Run cargo fmt
-        run: cargo fmt --all -- --config imports_granularity=Crate,group_imports=One --check
+        run: cargo fmt --all -- --check
 
   udeps:
     name: Unused Dependencies

rustfmt.toml

@@ -0,0 +1,3 @@
+unstable_features = true
+imports_granularity = "Crate"
+group_imports = "One"