Add a motivation comment for containerdebug

Author: nightkr

stackable-base/Dockerfile

@@ -196,7 +196,11 @@ EOF
 
 COPY --from=config-utils --chown=${STACKABLE_USER_UID}:0 /config-utils/target/release/config-utils /stackable/config-utils
 COPY --from=config-utils --chown=${STACKABLE_USER_UID}:0 /config-utils/config-utils_bin.cdx.xml /stackable/config-utils.cdx.xml
+
+# **containerdebug**
+# Debug tool that logs generic system information.
 COPY --from=containerdebug --chown=${STACKABLE_USER_UID}:0 /containerdebug/target/release/containerdebug /stackable/containerdebug
+
 ENV PATH="${PATH}:/stackable"
 
 # These labels have mostly been superceded by the OpenContainer spec annotations below but it doesn't hurt to include them