chore: fix the pipeline

[zhiying-lin]

What type of PR is this?

/kind deprecation

What this PR does / why we need it:

fixed the broken trivy pipeline, https://github.com/Azure/fleet-networking/actions/runs/14512625990/job/40714583521
This is a scheduled Ubuntu 20.04 retirement. Ubuntu 20.04 LTS runner will be removed on 2025-04-15.

Which issue(s) this PR fixes:

Fixes #

Requirements:

• run make reviewable for basic local test
• Read and followed fleet-networking's Code of conduct.
• uses conventional commit messages
• includes documentation
• adds unit tests

How has this code been tested

Special notes for your reviewer

[kaito-pr-agent]

Title

(Describe updated until commit 16c7f56)

Update workflow runners to use ubuntu-latest

---

Description

• Updated workflow runners to use ubuntu-latest instead of ubuntu-20.04.

• Fixed pipeline issues related to deprecated Ubuntu 20.04 runner.

---

Changes walkthrough 📝

	Relevant files
Refactoring	publish-image.yml Update `publish-image.yml` runner                                                .github/workflows/publish-image.yml Changed runs-on from ubuntu-20.04 to ubuntu-latest. +2/-2      trivy.yml Update `trivy.yml` runner                                                                .github/workflows/trivy.yml Changed runs-on from ubuntu-20.04 to ubuntu-latest. +2/-2

---

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PR Reviewer Guide 🔍

(Review updated until commit 16c7f56)

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ No major issues detected

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.14%. Comparing base (93a67d4) to head (16c7f56).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #290      +/-   ##
==========================================
- Coverage   80.24%   80.14%   -0.10%     
==========================================
  Files          29       29              
  Lines        4065     4065              
==========================================
- Hits         3262     3258       -4     
- Misses        639      642       +3     
- Partials      164      165       +1     

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