Added a dockerfile to generate data for the ML step.

One can now simply build the docker image and then start a new container
which contains the result from the SZZ algorithm.

code/Dockerfile

@@ -0,0 +1,32 @@
+FROM java:8-jdk-alpine
+
+RUN apk add --no-cache --update python3 git
+
+ADD . /root/
+
+WORKDIR /root
+RUN git clone https://github.com/jenkinsci/jenkins.git
+
+WORKDIR /root/fetch_jira_bugs
+RUN python3 fetch.py
+RUN python3 git_log_to_array.py --repo-path ../jenkins
+RUN python3 find_bug_fixes.py --gitlog ./gitlog.json --issue-list ./issues
+
+WORKDIR /root/szz
+
+RUN apk add --no-cache --update openjdk8 curl
+
+RUN mkdir /usr/lib/gradle
+WORKDIR /usr/lib/gradle
+RUN set -x \
+  && curl -L -O https://services.gradle.org/distributions/gradle-4.10.3-bin.zip \
+  && unzip gradle-4.10.3-bin.zip
+
+ENV PATH ${PATH}:/usr/lib/gradle/gradle-4.10.3/bin
+
+WORKDIR /root/szz
+
+RUN gradle build && gradle fatJar
+RUN java -jar ./build/libs/szz_find_bug_introducers-0.1.jar -i ../fetch_jira_bugs/issue_list.json -r ../jenkins
+
+WORKDIR /root