ci: adopt reusable workflows from `named-data/actions`

Change-Id: Ib5b73ca2082cec8fc105a875f5c261a979db11c7
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f328d39..e5cc01a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,63 +3,15 @@
   push:
     paths-ignore:
       - 'docs/**'
+      - '*.conf.sample'
       - '*.md'
       - '.mailmap'
   workflow_dispatch:
 
-permissions:
-  contents: read
+permissions: {}
 
 jobs:
-  linux:
-    name: ${{ matrix.compiler }} on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-20.04]
-        compiler: [g++-7, g++-8, g++-9, g++-10,
-                   clang++-7, clang++-8, clang++-9, clang++-10, clang++-11, clang++-12]
-        include:
-          - os: ubuntu-22.04
-            compiler: g++-11
-          - os: ubuntu-22.04
-            compiler: g++-12
-          - os: ubuntu-22.04
-            compiler: clang++-13
-          - os: ubuntu-22.04
-            compiler: clang++-14
-    env:
-      CXX: ${{ matrix.compiler }}
-    steps:
-      - name: Install C++ compiler
-        run: |
-          sudo apt-get -qy install ${CXX/clang++/clang}
-          ${CXX} --version
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Build and test
-        run: ./.jenkins
-
-  macos:
-    name: Xcode ${{ matrix.xcode }} on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [macos-11]
-        xcode: ['12.4', '12.5', '13.2']
-        include:
-          - os: macos-12
-            xcode: '13.4'
-          - os: macos-12
-            xcode: '14.2'
-    steps:
-      - name: Set up Xcode
-        uses: maxim-lobanov/setup-xcode@v1
-        with:
-          xcode-version: ${{ matrix.xcode }}
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Build and test
-        run: ./.jenkins
+  Ubuntu:
+    uses: named-data/actions/.github/workflows/jenkins-script-ubuntu.yml@v1
+  macOS:
+    uses: named-data/actions/.github/workflows/jenkins-script-macos.yml@v1