ci: Simplify CI workflow to only run one job

.github/workflows/ci.yml

@@ -6,23 +6,13 @@ env:
   RUSTFLAGS: "-Dwarnings"
 
 jobs:
-  clippy_check:
+  checks:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: Run Clippy
         run: cargo clippy --all-targets --all-features
-
-  format_check:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Run Rustfmt
+      - name: Run Rustfmt (run `cargo fmt --all` to fix)
         run: cargo fmt --all -- --check
-
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
       - name: Build
         run: cargo build --all-targets --all-features