Update Dockerfile to use user-provided MySQL IP

Dockerfile

@@ -21,13 +21,15 @@ RUN mkdir fineract
 COPY . fineract
 
 WORKDIR fineract
-RUN sed -i 's/localhost/fineractmysql/' ./fineract-provider/src/main/resources/sql/migrations/list_db/V1__mifos-platform-shared-tenants.sql
+ARG mysqlserver=fineractmysql
+RUN sed -i "s/localhost/${mysqlserver}/" ./fineract-provider/src/main/resources/sql/migrations/list_db/V1__mifos-platform-shared-tenants.sql
 RUN ./gradlew clean war
 
 
 FROM bitnami/tomcat:7.0.94 as fineract
 
 USER root
+ARG mysqlserver=fineractmysql
 RUN apt-get update -qq && apt-get install -y wget
 ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64/jre
 
@@ -35,6 +37,7 @@ COPY --from=builder /fineract/build/libs/fineract-provider.war /opt/bitnami/tomc
 
 RUN keytool -genkey -keyalg RSA -alias tomcat -keystore /opt/bitnami/tomcat/tomcat.keystore -keypass xyz123 -storepass xyz123 -noprompt -dname "CN=Fineract, OU=Fineract, O=Fineract, L=Unknown, ST=Unknown, C=Unknown"
 COPY ./docker/server.xml /opt/bitnami/tomcat/conf
+RUN sed -i "s/fineractmysql/${mysqlserver}/" /opt/bitnami/tomcat/conf/server.xml
 RUN chmod 664 /opt/bitnami/tomcat/conf/server.xml
 WORKDIR /opt/bitnami/tomcat/lib
 RUN wget http://central.maven.org/maven2/org/drizzle/jdbc/drizzle-jdbc/1.4/drizzle-jdbc-1.4.jar