set default Dockerfile CMD to -help

[walterddr]

Default docker entrypoint is set to "run" which is an invalid argument to the ENTRYPOINT pinot-admin.sh.

setting it to -help instead.

[codecov-commenter]

Codecov Report

Merging #7767 (24e11ae) into master (362f3e1) will decrease coverage by 6.46%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7767      +/-   ##
============================================
- Coverage     71.63%   65.16%   -6.47%     
+ Complexity     4079     4076       -3     
============================================
  Files          1578     1533      -45     
  Lines         80629    78764    -1865     
  Branches      11982    11780     -202     
============================================
- Hits          57756    51330    -6426     
- Misses        18981    23781    +4800     
+ Partials       3892     3653     -239     

Flag	Coverage Δ
integration1	?
integration2	?
unittests1	68.60% <ø> (-0.01%)	⬇️
unittests2	14.59% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...a/org/apache/pinot/common/metrics/MinionMeter.java	0.00% <0.00%> (-100.00%)	⬇️
...g/apache/pinot/common/metrics/ControllerMeter.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/common/metrics/BrokerQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/common/metrics/MinionQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
...he/pinot/common/messages/SegmentReloadMessage.java	0.00% <0.00%> (-100.00%)	⬇️
...pinot/core/data/manager/realtime/TimerService.java	0.00% <0.00%> (-100.00%)	⬇️
...pinot/minion/exception/TaskCancelledException.java	0.00% <0.00%> (-100.00%)	⬇️
...not/common/exception/HttpErrorStatusException.java	0.00% <0.00%> (-100.00%)	⬇️
...t/core/startree/plan/StarTreeDocIdSetPlanNode.java	0.00% <0.00%> (-100.00%)	⬇️
...ot/common/restlet/resources/TableMetadataInfo.java	0.00% <0.00%> (-100.00%)	⬇️
... and 355 more

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