[YUNIKORN-2799] Solve dockerfile warning which emerged while building

[ryankert01]

What is this PR for?

1 warning found:

• RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 17)
  Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior
  More info: https://docs.docker.com/go/dockerfile/rule/redundant-target-platform/
  Dockerfile:17

  15 |     # See the License for the specific language governing permissions and
  16 |     # limitations under the License.
  17 | >>> FROM --platform=$TARGETPLATFORM scratch
  18 |     COPY --chown=0:0 LICENSE NOTICE third-party-licenses.md yunikorn-scheduler /
  19 |     USER 4444:4444

from docker version 27.1.1

suggested change: remove --platform=$TARGETPLATFORM in dockerfile
ref: https://docs.docker.com/reference/build-checks/redundant-target-platform/#examples

change:

1. shim: RedundantTargetPlatform
2. web:

• RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 32)
• LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 36)
• FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 20)
• InvalidDefaultArgInFrom: Default value for ARG node:${NODE_VERSION}-alpine results in empty or invalid base image name (line 20)

What type of PR is it?

• - Bug Fix
• - Improvement
• - Feature
• - Documentation
• - Hot Fix
• - Refactoring

Todos

• - Task

What is the Jira issue?

https://issues.apache.org/jira/browse/YUNIKORN-2799

How should this be tested?

Screenshots (if appropriate)

Questions:

• - The licenses files need update.
• - There is breaking changes for older versions.
• - It needs documentation.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.77%. Comparing base (aa67a85) to head (ccdff6d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   38.77%   38.77%           
=======================================
  Files           2        2           
  Lines          49       49           
=======================================
  Hits           19       19           
  Misses         27       27           
  Partials        3        3           

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[craigcondit]

+1 LGTM.