Add automated tests

.github/workflows/ubuntu.yml

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+name: Ubuntu
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+    - name: dependencies
+      run: sudo apt-get install -y build-essential libboost-test-dev libboost-program-options-dev cmake zlib1g-dev libbz2-dev liblzma-dev libicu-dev uchardet libuchardet-dev libzip-dev wget
+    - name: cmake
+      run: |
+        cmake -E make_directory build
+        cd build
+        cmake ..
+    - name: Compile
+      working-directory: build
+      run: cmake --build . -j2
+    - name: Unit Tests
+      working-directory: build
+      run: ctest -j2
+    - name: Regression Tests
+      working-directory: tests
+      run: |
+        ../build/bin/warc2text -v --json hello-world.warc.gz > hello-world.json
+        shasum -c checksums.txt

tests/checksums.txt

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+28d6c5e68f9e8c3275015ff1bd082fce3382441a  hello-world.json

tests/hello-world.json.expected

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+{"f":"./hello-world.warc.gz","o":907,"s":723,"rs":11,"ps":12,"l":"en","u":"http://iipc.github.io/warc-specifications/primers/web-archive-formats/hello-world.txt","c":"text/plain","ts":"2015-07-08T21:55:13Z","p":"Hello World\n"}