perf(ci): Speed up CI by 1.3-1.4 minutes using improved caching strategy

[stefanbinoj]

ref #1064
depends on #1068

NOTE:

• The CI actions need to be run 2 times for the result to be present (1st time for building and caching the packages, 2nd time for viewing the result)

Attachments

Before	After
Total = 2:05 mins	Total = 32 sec

Links to CI

Before	After
View Before	View After

Problem

• While installing dependencies using pnpm install in CI, it runs post-install script, which in turn executes the run-on-packages script.

"postinstall": "pnpm run-on-packages build",
"run-on-packages": "pnpm run --filter=!helperai --if-present --workspace-concurrency=1"

• This builds all the monorepo packages :

• Building all packages during pnpm install makes it not cacheable
• Also, it builds the unnecessary marketing package that is only used for the marketing front page and isn't necessary for testing (which adds 20-30 seconds)

Solution

• Running pnpm install without the post-install script
• Individually building and caching the dependent packages sequentially in order
• This helps in reducing a 1.40 - 2.10 min step to a 20-30 second step (saves ~1.30 mins)

Without cache - new code	With cache - new code

AI Usage

• Warp AI (auto-mode): was used for reasoning and helping to understand the workflow and package dependencies
• GPT-5 via Warp : was used for asking questions and reasoning about side-effects of each CI code changed.

Self Review

• All code was written by myself and I have reviewed all the code

Live Stream Disclosure

Viewed both live streams of antiwork and guidelines to follow

[stefanbinoj]

@binary-koan can i get a review?

[stefanbinoj]

@binary-koan seems like a flaky test is failing (unrelated to changes in this PR)