ci(docker): init docker files

Dockerfile.flink

@@ -0,0 +1,14 @@
+FROM public.ecr.aws/docker/library/flink:1.20.0-scala_2.12-java17
+
+# Set working directory
+WORKDIR /opt/flink
+
+# Set environment variables for Flink mini-cluster
+ENV FLINK_HOME /opt/flink
+ENV PATH=$FLINK_HOME/bin:$PATH
+
+# Expose necessary ports for the Flink UI (JobManager) and job manager
+EXPOSE 8081 6123
+
+# Command to start Flink JobManager and TaskManager in a mini-cluster setup
+CMD ["bin/start-cluster.sh"]