Add new GitHub Actions workflows for documentation

.github/workflows/docs.yml

@@ -0,0 +1,135 @@
+name: Documentation
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - 'crates/hyper-custom-cert/src/**'
+      - 'crates/hyper-custom-cert/README.md'
+      - 'README.md'
+      - 'crates/hyper-custom-cert/Cargo.toml'
+      - '.github/workflows/docs.yml'
+  pull_request:
+    branches: [main]
+    paths:
+      - 'crates/hyper-custom-cert/src/**'
+      - 'crates/hyper-custom-cert/README.md'
+      - 'README.md'
+      - 'crates/hyper-custom-cert/Cargo.toml'
+      - '.github/workflows/docs.yml'
+
+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
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Build documentation
+        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"
+          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 $FLAGS --no-deps
+
+      - name: Test documentation examples
+        shell: bash
+        run: |
+          FLAGS=""
+          if [ "${{ 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
+
+  readme-sync:
+    name: Check README synchronization
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Install cargo-readme
+        run: cargo install cargo-readme
+
+      - name: Check README is up to date
+        working-directory: crates/hyper-custom-cert
+        run: |
+          # Generate README from lib.rs documentation
+          cargo readme > README_generated.md
+          
+          # Compare with existing README
+          if ! diff -u README.md README_generated.md; then
+            echo "ERROR: README.md is not synchronized with lib.rs documentation"
+            echo "Run 'cargo readme > README.md' in crates/hyper-custom-cert/ to update"
+            exit 1
+          fi
+          
+          # Clean up
+          rm README_generated.md
+
+  link-check:
+    name: Check documentation links
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Build documentation
+        working-directory: crates/hyper-custom-cert
+        run: cargo doc --all-features --no-deps
+
+      - name: Install lychee
+        run: |
+          curl -sSL https://github.com/lycheeverse/lychee/releases/latest/download/lychee-x86_64-unknown-linux-gnu.tar.gz | tar xz
+          sudo mv lychee /usr/local/bin/
+
+      - name: Check links in documentation
+        run: |
+          # Check links in generated documentation
+          lychee 'crates/hyper-custom-cert/target/doc/**/*.html' --exclude-path target --base crates/hyper-custom-cert/target/doc
+          
+          # Check links in README files
+          lychee README.md crates/hyper-custom-cert/README.md