Fix variables escape

Author: mkjsix

Dockerfile

@@ -19,12 +19,11 @@ RUN apt-get update \
     && echo "sdkman_auto_selfupdate=false" >> "${SDKMAN_DIR}/etc/config" \
     && echo "sdkman_insecure_ssl=true" >> "${SDKMAN_DIR}/etc/config" \
     && chmod +x "${SDKMAN_DIR}/bin/sdkman-init.sh"
-RUN bash -c "source "${SDKMAN_DIR}/bin/sdkman-init.sh" \
+RUN bash -c "source ${SDKMAN_DIR}/bin/sdkman-init.sh \
         && sdk version \
-        && sdk install java "${JAVA_VERSION}" \
-        && sdk install maven "${MAVEN_VERSION}" \
-        && rm -rf "${SDKMAN_DIR}/archives/*" \
-        && rm -rf "${SDKMAN_DIR}/tmp/*"
+        && sdk install java ${JAVA_VERSION} \
+        && rm -rf ${SDKMAN_DIR}/archives/* \
+        && rm -rf ${SDKMAN_DIR}/tmp/*"
 
 WORKDIR /opt/app