fix: minor security hardening

[toddbaert]

Pin GitHub Actions to commit SHAs, add npm --ignore-scripts, and run the testbed image as non-root.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7575a1d and 51b4ac6.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• .github/workflows/release-please.yml
• flagd/Dockerfile

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