Improved Dockerfile

Dockerfile

@@ -1,13 +1,18 @@
 FROM openjdk:8-jre-alpine
-RUN apk add --no-cache --update nodejs
+
+ARG SONAR_VERSION=3.3.0.1492
+ARG SONAR_SCANNER_CLI=sonar-scanner-cli-${SONAR_VERSION}
+ARG SONAR_SCANNER=sonar-scanner-${SONAR_VERSION}
+
+RUN apk add --no-cache --update nodejs curl
 COPY drone-sonar /bin/
-COPY lib/sonar-scanner-cli-3.3.0.1492.zip /bin
-
 WORKDIR /bin
-RUN unzip sonar-scanner-cli-3.3.0.1492.zip \
-  && mv sonar-scanner-3.3.0.1492 sonar-scanner \
-  && rm -rf sonar-scanner-cli-3.3.0.1492.zip
 
-ENV PATH $PATH:/bin/sonar-scanner/bin
+RUN curl https://binaries.sonarsource.com/Distribution/sonar-scanner-cli/${SONAR_SCANNER_CLI}.zip -so /bin/${SONAR_SCANNER_CLI}.zip
+RUN unzip ${SONAR_SCANNER_CLI}.zip \
+    && rm ${SONAR_SCANNER_CLI}.zip \
+    && apk del curl
+
+ENV PATH $PATH:/bin/${SONAR_SCANNER}/bin
 
 ENTRYPOINT /bin/drone-sonar