chore: refactor dockerfile (#124)

java.Dockerfile

@@ -2,23 +2,18 @@ FROM openjdk:8
 
 RUN mkdir /app
 WORKDIR /app
-
 RUN git clone https://github.com/twilio/twilio-java.git
+WORKDIR /app/twilio-java/
 
-RUN rm -rf /app/twilio-java/src/main/java/com/twilio/rest
-RUN rm -rf /app/twilio-java/src/test/java/com/twilio/rest/
-RUN rm -rf /app/twilio-java/src/test/java/com/twilio/compliance/
-RUN rm -rf /app/twilio-java/src/main/java/com/twilio/example
-RUN rm -rf /app/twilio-java/src/test/java/com/twilio/http/TwilioRestClientTest.java
-RUN rm -rf /app/twilio-java/src/test/java/com/twilio/base/ReaderTest.java
-RUN rm -rf /app/twilio-java/pom.xml
+RUN rm -rf /src/main/java/com/twilio/rest/ \
+    rm -rf /src/test/java/com/twilio/rest/ \
+    rm -rf /src/main/java/com/twilio/example\
+    rm -rf /src/test/java/com/twilio/base/ReaderTest.java 
 
-COPY examples/java/rest /app/twilio-java/src/main/java/com/twilio/rest
-COPY examples/java/unit-test/rest /app/twilio-java/src/test/java/com/twilio/rest/
-COPY examples/java/pom.xml /app/twilio-java/pom.xml
+COPY examples/java/rest /src/main/java/com/twilio/rest
+COPY examples/java/unit-test/rest /src/test/java/com/twilio/rest/
+COPY examples/java/pom.xml /pom.xml
 
 RUN apt-get update && apt-get install maven -y
 
-WORKDIR /app/twilio-java/
-
 CMD mvn clean test