Require Java 8, upgrade dependencies, integrate code formatter and CI build

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+name: cc-warc-examples build
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 8, 11, 17, 21 ]
+    name: Java ${{ matrix.java }}
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Setup JDK
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: ${{ matrix.java }}
+          cache: 'maven'
+
+      - name: Build
+        run: mvn verify javadoc:aggregate

README.md

@@ -1,4 +1,4 @@
-![Common Crawl Logo](http://commoncrawl.org/wp-content/uploads/2016/12/logocommoncrawl.png)
+![Common Crawl Logo](https://avatars.githubusercontent.com/u/1194841?s=64)
 
 # Common Crawl WARC Examples