Added dockerfile to do the below

Java 8 based on eclipse-temurin
Spark 2.4.8
Cassandra-Data-Migrator packaged jar
DSBulk
CQLSH

Author: pravinbhat

Dockerfile

@@ -3,20 +3,22 @@ FROM eclipse-temurin:8-jammy
 RUN apt update && apt install -y openssh-server vim
 RUN service ssh start
 
+# Add all migration tools to path
 RUN mkdir -p /assets/
 
-# Build the jar locally before building docker image
-COPY ./target/cassandra-data-migrator-2.9.jar /assets/
+# Download all migration dependencies
+RUN cd /assets && curl -OL https://downloads.datastax.com/dsbulk/dsbulk.tar.gz && tar -xzf ./dsbulk.tar.gz && rm ./dsbulk.tar.gz
+RUN cd /assets && curl -OL https://downloads.datastax.com/enterprise/cqlsh-astra.tar.gz && tar -xzf ./cqlsh-astra.tar.gz && rm ./cqlsh-astra.tar.gz
+RUN cd /assets && curl -OL https://archive.apache.org/dist/spark/spark-2.4.8/spark-2.4.8-bin-hadoop2.7.tgz && tar -xzf ./spark-2.4.8-bin-hadoop2.7.tgz && rm ./spark-2.4.8-bin-hadoop2.7.tgz
 
+# Copy CDM jar & template files
+COPY ./target/cassandra-data-migrator-*.jar /assets/
 COPY ./src/resources/sparkConf.properties /assets/
 COPY ./src/resources/partitions.csv /assets/
 COPY ./src/resources/primary_key_rows.csv /assets/
 COPY ./src/resources/runCommands.txt /assets/
 
-RUN cd /assets && curl -OL https://downloads.datastax.com/dsbulk/dsbulk.tar.gz && tar -xzf ./dsbulk.tar.gz && rm ./dsbulk.tar.gz
-RUN cd /assets && curl -OL https://downloads.datastax.com/enterprise/cqlsh-astra.tar.gz && tar -xzf ./cqlsh-astra.tar.gz && rm ./cqlsh-astra.tar.gz
-RUN cd /assets && curl -OL https://archive.apache.org/dist/spark/spark-2.4.8/spark-2.4.8-bin-hadoop2.7.tgz && tar -xzf ./spark-2.4.8-bin-hadoop2.7.tgz && rm ./spark-2.4.8-bin-hadoop2.7.tgz
-
+# Add all migration tools to path
 ENV PATH="${PATH}:/assets/dsbulk-1.10.0/bin/:/assets/cqlsh-astra/bin/:/assets/spark-2.4.8-bin-hadoop2.7/bin/"
 
 EXPOSE 22