ci: fix CircleCI apt + Slack notification hard-fail

[ch4r10t33r]

Summary

• CircleCI e2e was dying at Install jq because apt-get update fails on the Cypress image's Chrome apt source (NO_PUBKEY FD533C07C264648F). Remove those sources before updating.
• Slack/Cloudflare Pages notification job was failing the build check with Cloudflare API auth error 10000. Mark that step continue-on-error: true so a bad/expired CF_API_TOKEN does not block releases (token still needs rotation in repo secrets).

Test plan

• CircleCI e2e on staging gets past Install jq
• Notifications workflow no longer fails the commit status when CF auth errors

Summary by CodeRabbit

• Chores
  • Improved CI/CD pipeline stability and workflow reliability to enhance deployment processes.

[cloudflare-workers-and-pages]

Deploying x with    Cloudflare Pages

Latest commit:	2370996
Status:	⚡️  Build in progress...

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[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 787cfd5a-c6f6-4fe9-9347-6d66660b7a33

📥 Commits

Reviewing files that changed from the base of the PR and between e52be72 and 2370996.

📒 Files selected for processing (2)

• .circleci/config.yml
• .github/workflows/notifications.yml

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📝 Walkthrough

Walkthrough

The CircleCI end-to-end test job cleans Chrome APT source files before package installation. The deployment notification workflow continues when the Slack action fails.

Changes

CircleCI package setup

Layer / File(s)	Summary
Chrome APT source cleanup .circleci/config.yml	The end-to-end test job removes Google Chrome APT source list files before updating package metadata and installing curl and jq. The cleanup tolerates missing files.

Deployment notifications

Layer / File(s)	Summary
Slack failure handling .github/workflows/notifications.yml	The Slack notification step ignores action failures and allows subsequent workflow execution to continue.

Estimated code review effort: 2 (Simple) | ~5 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-apt-and-slack-checks

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