Started Dockerfile for backend service

Change-Id: I561f37c8026cc4ffbf3a9b80538094d24d076a32
diff --git a/Dockerfile b/Dockerfile
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+# Use alpine linux as base image
+FROM openjdk:8-alpine as builder
+
+# Copy repository respecting .dockerignore
+COPY . /kustvakt
+
+WORKDIR /kustvakt
+
+RUN apk update && \
+    apk add --no-cache git \
+            maven
+
+RUN git config --global user.email "korap+docker@ids-mannheim.de" && \
+    git config --global user.name "Docker"
+
+# Install Koral
+RUN mkdir Koral && git clone https://github.com/KorAP/Koral.git Koral && \
+    cd Koral && \
+    git checkout master && \
+    mvn clean install
+
+RUN rm -r Koral
+
+# Install Krill
+RUN git clone https://github.com/KorAP/Krill.git Krill && \
+    cd Krill && \
+    git checkout master && \
+    mvn clean install
+
+RUN rm -r Krill
+
+# Install Kustvakt core
+RUN cd core && \
+    mvn clean install
+
+# Package lite
+RUN mkdir built && \
+    cd lite && \
+    mvn clean package && \
+    find target/Kustvakt-lite-*.jar -exec mv {} ../built/Kustvakt-lite.jar ';'
+
+RUN sed 's!\(krill\.indexDir\s*=\).\+!\1\/kustvakt\/index!' lite/src/main/resources/kustvakt-lite.conf \
+    > built/kustvakt-lite.conf
+
+RUN rm -r core && \
+    rm -r full && \
+    rm -r lite && \
+    rm -r sample-index
+
+RUN apk del git \
+            maven
+
+RUN cd ${M2_HOME} && rm -r .m2
+
+FROM openjdk:8-alpine
+
+RUN addgroup -S korap && \
+    adduser -S kustvakt -G korap && \
+    mkdir kustvakt && \
+    chown -R kustvakt.korap /kustvakt
+
+WORKDIR /kustvakt
+
+COPY --from=builder /kustvakt/built/* /kustvakt/
+
+USER kustvakt
+
+EXPOSE 8089
+
+CMD ["java", "-jar", "Kustvakt-lite.jar"]
+
+# TODO:
+#   - support lite build
+#   - support full build