ci: Run cargo fmt --check to ensure code is always properly formatted

.github/workflows/ci.yml

@@ -34,9 +34,14 @@ jobs:
         with:
           toolchain: ${{ matrix.toolchain }}
           target: ${{ matrix.target }}
+          components: rustfmt, clippy
 
+      - run: cargo fmt --check
+      - run: cargo clippy --target=${{ matrix.target }} -- -Dwarnings
       - run: cargo build --target=${{ matrix.target }}
       - run: cargo doc --target=${{ matrix.target }}
+        env:
+          RUSTDOCFLAGS: -Dwarnings
       # Temporary test non-target only.
       # TODO: Test in emulator or something.
       - run: cargo test

src/config.rs

@@ -20,10 +20,13 @@ impl fmt::Debug for Config {
             .field("buf_id", &self.buf_id)
             .field("filter", &self.filter)
             .field("tag", &self.tag)
-            .field("custom_format", match &self.custom_format {
-                Some(_) => &"Some(_)",
-                None => &"None",
-            })
+            .field(
+                "custom_format",
+                match &self.custom_format {
+                    Some(_) => &"Some(_)",
+                    None => &"None",
+                },
+            )
             .finish()
     }
 }