hack: replace fragile awk pipeline with 'go env GOARCH' in install.sh

[Ankitsinghsisodya]

Fixes #8999

Summary

• Replace go env | grep GOARCH | awk -F\'' '{print $2}' with $(go env GOARCH) in hack/install.sh

go env GOARCH is the canonical, documented way to read a single Go environment variable.

[knative-prow]

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[Copilot]

Pull request overview

This PR improves the robustness of the local development install script by switching to Go’s canonical single-variable environment query for detecting the target architecture, aligning with the documented go env <VAR> usage.

Changes:

• Replace a fragile go env | grep ... | awk ... pipeline with go env GOARCH to populate KO_ARCH.
• Keep KO_FLAGS platform selection behavior the same while making KO_ARCH detection more stable.

---

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[creydr]

/ok-to-test

[creydr]

Thanks for the cleanup @Ankitsinghsisodya

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Ankitsinghsisodya, creydr

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Needs approval from an approver in each of these files:

• hack/OWNERS [creydr]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 51.07%. Comparing base (c6be563) to head (0ef11cb).
⚠️ Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9000      +/-   ##
==========================================
+ Coverage   51.02%   51.07%   +0.05%     
==========================================
  Files         409      409              
  Lines       22001    21999       -2     
==========================================
+ Hits        11225    11237      +12     
+ Misses       9914     9900      -14     
  Partials      862      862              

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