Improve docker build performance

[Warashi]

What this PR does:

• Use --platform=$BUILDPLATFORM flag to build web static assets in a docker multi-stage build
• Use docker build cache from the latest image in GitHub Actions Workflow

Why we need it:

• I want to reduce CI build time

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[Warashi]

With this modification, we can now use node 20 or later. I want to discuss whether we should upgrade this to current LTS versions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 26.34%. Comparing base (14f3d0b) to head (0a065cd).
Report is 259 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5578   +/-   ##
=======================================
  Coverage   26.33%   26.34%           
=======================================
  Files         467      467           
  Lines       50114    50114           
=======================================
+ Hits        13198    13202    +4     
+ Misses      35860    35857    -3     
+ Partials     1056     1055    -1     

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[khanhtc1202]

Nice improvement 👍

[ffjlabo]

[IMO] How about adding mode=max ?
It seems that we can cache all layer with it.
https://docs.docker.com/build/cache/backends/#cache-mode

It might be more efficient because our images are often built with mutl-stage build to download dependencies.

[Warashi]

Unfortunately, the inline cache doesn't support the max cache mode.

However, note that the inline cache exporter only supports min cache mode.

ref; https://docs.docker.com/build/ci/github-actions/cache/#inline-cache

We can consider using the GitHub cache, but it's experimental yet. So, I want to start by using inline cache and min cache mode.

[ffjlabo]

I got it. Thanks!