update ci

- Fix nested `if let` statements to improve readability and correctness.
- Reorganize imports for consistency and structure.

.github/workflows/release.yml

@@ -12,6 +12,28 @@ jobs:
   docs:
     name: Build and validate documentation
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: crates/hyper-custom-cert
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: default-features
+            features: ""
+            no-default-features: false
+          - name: no-default-features
+            features: ""
+            no-default-features: true
+          - name: rustls
+            features: "rustls"
+            no-default-features: true
+          - name: insecure-dangerous
+            features: "insecure-dangerous"
+            no-default-features: false
+          - name: all-features
+            features: "rustls,insecure-dangerous"
+            no-default-features: true
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -31,11 +53,30 @@ jobs:
 
       - name: Build documentation
         shell: bash
-        run: cargo doc -p hyper-custom-cert --no-deps
+        run: |
+          FLAGS=""
+          if [ "${{ matrix.no-default-features }}" = "true" ]; then FLAGS="$FLAGS --no-default-features"; fi
+          if [ -n "${{ matrix.features }}" ]; then FLAGS="$FLAGS --features ${{ matrix.features }}"; fi
+          echo "Running: cargo doc $FLAGS --no-deps"
+          cargo doc  $FLAGS --no-deps
+
+      - name: Check documentation warnings
+        shell: bash
+        run: |
+          FLAGS=""
+          if [ "${{ matrix.no-default-features }}" = "true" ]; then FLAGS="$FLAGS --no-default-features"; fi
+          if [ -n "${{ matrix.features }}" ]; then FLAGS="$FLAGS --features ${{ matrix.features }}"; fi
+          echo "Running: cargo doc $FLAGS --no-deps"
+          RUSTDOCFLAGS="-D warnings" cargo doc $FLAGS --no-deps
 
       - name: Test documentation examples
         shell: bash
-        run: cargo test --doc
+        run: |
+          FLAGS=""
+          if [ "${{ matrix.no-default-features }}" = "true" ]; then FLAGS="$FLAGS --no-default-features"; fi
+          if [ -n "${{ matrix.features }}" ]; then FLAGS="$FLAGS --features ${{ matrix.features }}"; fi
+          echo "Running: cargo test --doc $FLAGS"
+          cargo test --doc $FLAGS
 
   test:
     name: Test before release