ci: add github workflows

.github/dependabot.yml

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+version: 2
+updates:
+- package-ecosystem: cargo
+  directory: "/"
+  schedule:
+    interval: daily
+    time: "13:00"
+  open-pull-requests-limit: 10

.github/workflows/build.yml

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+on: [push, pull_request]
+
+name: build
+
+jobs:
+  pingora:
+    strategy:
+      matrix:
+        # TODO: add nightly
+        toolchain: [stable]
+        profile: [minimal, default]
+    runs-on: ubuntu-latest
+    # Only run on "pull_request" event for external PRs. This is to avoid
+    # duplicate builds for PRs created from internal branches.
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
+
+      - name: Install build dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y cmake libclang-dev wget gnupg ca-certificates lsb-release --no-install-recommends
+          # openresty is used for convenience in tests as a server.
+          wget -O - https://openresty.org/package/pubkey.gpg | sudo gpg --dearmor -o /usr/share/keyrings/openresty.gpg
+          echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/openresty.gpg] http://openresty.org/package/ubuntu $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/openresty.list > /dev/null
+          sudo apt update
+          sudo apt install -y openresty --no-install-recommends
+
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          profile: ${{ matrix.profile }}
+          components: rustfmt, clippy
+          override: true
+          default: true
+
+      - name: Run cargo fmt
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: -- --check
+
+      - name: Run cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --verbose --lib --bins --tests --no-fail-fast
+
+      # Need to run doc tests separately.
+      # (https://github.com/rust-lang/cargo/issues/6669)
+      - name: Run cargo doc test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --verbose --doc
+
+      - name: Run cargo clippy
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --all-targets --all -- --deny=warnings
+
+      - name: Run cargo audit
+        uses: actions-rust-lang/audit@v1

.github/workflows/docs.yml

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+on:
+  push:
+    branches:
+      - master
+
+name: Docs
+
+jobs:
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
+
+      - name: Install build dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y cmake libclang-dev
+
+      - name: Install stable toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          default: true
+
+      - name: Run cargo doc
+        uses: actions-rs/cargo@v1
+        with:
+          command: doc
+          args: --no-deps --all-features