docker support

Dockerfile

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+FROM maven:3.5-jdk-8 as builder
+
+WORKDIR /app
+
+# download artifacts
+COPY pom.xml .
+RUN mvn dependency:resolve
+RUN mvn verify
+RUN mvn compiler:help
+
+# build
+COPY src ./src
+RUN mvn clean package -DskipTests
+RUN mv target/ysoserial-*all*.jar target/ysoserial.jar
+
+FROM java:8-jdk-alpine
+
+WORKDIR /app
+
+COPY --from=builder /app/target/ysoserial.jar .
+
+ENTRYPOINT ["java", "-jar", "ysoserial.jar"]