remove global platform arg in cassandra schema dockerfile

[jkandasa]

Which problem is this PR solving?

• Multi arch cassandra-schema container support is introduced in add multi arch support to cassandra-schema container #4122
• for some reason BUILDPLATFORM argument is not loaded, hence linux/amd64 base image taken to all platforms containers, which leads the following error on non linux/amd64 systems.

standard_init_linux.go:228: exec user process caused: exec format error

• To fix this issue, I removed the strict platform in base image of Dockerfile. Now the docker engine decide the base image architecture.

Short description of the changes

• Removed --platform=${BUILDPLATFORM:-linux/amd64} from the base image.

Tested

• Verified this change locally by running the following command under the directory plugin/storage/cassandra, result of the execution, I see actual platform images.

platforms="linux/amd64,linux/s390x,linux/ppc64le,linux/arm64"

docker buildx build --push \
  --progress=plain \
  --platform ${platforms} \
  --file ./Dockerfile \
  --tag quay.io/redhat-distributed-tracing-qe/jaeger-cassandra-schema:1.40.0 .

• images are available in: quay.io/redhat-distributed-tracing-qe/jaeger-cassandra-schema:1.40.0

Document about platform argument on a base image

• https://docs.docker.com/engine/reference/builder/#from
  

[codecov]

Codecov Report

Base: 97.16% // Head: 97.16% // No change to project coverage 👍

Coverage data is based on head (d25a5ba) compared to base (5f7865a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4123   +/-   ##
=======================================
  Coverage   97.16%   97.16%           
=======================================
  Files         295      295           
  Lines       17413    17413           
=======================================
  Hits        16920    16920           
  Misses        397      397           
  Partials       96       96           

Flag	Coverage Δ
unittests	97.16% <ø> (ø)

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