Transition to Cross-Compilation for faster Docker Build Times

[dlaw4608]

closes #787

This pull request introduces significant improvements to the Docker build process by implementing cross-compilation.

Building arm64 image via QEMU takes over 15 mins on github actions, making it slow to build for development.

Building the image via cross compile dropped this build time to 2 min 30

Changes Made

1. Dockerfile Updates:

   • Introduced cross-compilation support by using ARG TARGETARCH.
   • Utilized --platform=$BUILDPLATFORM for multi-platform builds with Docker Buildx.

2. Workflow File:

   • Updated the workflow to leverage Docker Buildx for building and pushing images to multiple platforms (linux/amd64, linux/arm64).
   • Removed reliance on QEMU emulation, significantly speeding up the build process.

Benefits

• Faster Build Times: The new build process reduces the time from approximately 16 minutes to just 2 minutes and 30 seconds, representing an almost 8x improvement.
• Optimised Build Efficiency: Reduces overhead and simplifies the build process by eliminating the need for emulation.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.74%. Comparing base (ece13e8) to head (e9da3c3).
Report is 165 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #802      +/-   ##
==========================================
+ Coverage   80.20%   81.74%   +1.53%     
==========================================
  Files          64       76      +12     
  Lines        4492     6114    +1622     
==========================================
+ Hits         3603     4998    +1395     
- Misses        600      760     +160     
- Partials      289      356      +67     

Flag	Coverage Δ
bare-k8s-integration	4.48% <ø> (?)
controllers-integration	71.75% <ø> (?)
gatewayapi-integration	10.89% <ø> (?)
integration	?
istio-integration	56.17% <ø> (?)
unit	31.45% <ø> (+1.42%)	⬆️

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

Components	Coverage Δ
api/v1beta1 (u)	71.42% <ø> (ø)
api/v1beta2 (u)	85.35% <80.00%> (-6.08%)	⬇️
pkg/common (u)	88.13% <ø> (-0.70%)	⬇️
pkg/istio (u)	72.50% <ø> (-1.41%)	⬇️
pkg/log (u)	94.73% <ø> (ø)
pkg/reconcilers (u)	∅ <ø> (∅)
pkg/rlptools (u)	83.64% <ø> (+4.19%)	⬆️
controllers (i)	81.88% <81.96%> (+5.08%)	⬆️

see 42 files with indirect coverage changes

[KevFan]

Nice! This is quite an improvement, reducing the time from 15 minutes to 2.5 minutes for building the image of the Kuadrant Operator, which should enhance the development and upstream release feedback loop. Great work! 👍

Changes looks good to me! However, for some reason, the image build workflow was not run on this PR for some reason 🤔 Maybe amend the commit message and do a push again? It'll be nice to see that the image build github action completing successfully before merging this

[KevFan]

Verified this user guide using the quay.io/kuadrant/kuadrant-operator:crosscompile image that was built from the github action from this PR, and it was working as expected 👍

Changes looks good to me 💯