NO-JIRA: default to building --platform=linux/amd64 images in Docker builds

[jiridanek]

Description

This update sets the --platform flag in Docker build commands, allowing builds for specific architectures by using the ARCH variable. The default architecture is set to linux/amd64, ensuring compatibility and flexibility for multi-platform environments.

How Has This Been Tested?

❯ cd components/notebook-controller; gmake docker-build
❯ cd components/odh-notebook-controller; gmake docker-build

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

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[daniellutz]

/lgtm

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.77%. Comparing base (4ec227f) to head (6ca3011).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #596       +/-   ##
===========================================
+ Coverage   33.15%   55.77%   +22.61%     
===========================================
  Files           2       10        +8     
  Lines         941     2686     +1745     
===========================================
+ Hits          312     1498     +1186     
- Misses        598     1071      +473     
- Partials       31      117       +86     

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[atheo89]

Cool! Thanks Jiri!
/lgtm