Update build base image to -sfw

[mathieu-benoit]

Use the -sfw for the build stage.

Also, removed this warning:

npm warn config only Use `--omit=dev` to omit dev dependencies from the install.

[github-actions]

Overview

Image reference	hello-world:latest	hello-world:latest
- digest	4f937852f218	4f937852f218
- tag	latest	latest
- provenance	f08b7b9	7db5a0e
- vulnerabilities
- platform	linux/amd64	linux/amd64
- size	41 MB	41 MB
- packages	22	22

Policies (0 improved, 0 worsened)

Policy Name	hello-world:latest	hello-world:latest	Change	Standing
Default non-root user	✅	✅		No Change
No copyleft licenses	⚠️ 7	⚠️ 7		No Change
No fixable critical or high vulnerabilities	✅	✅		No Change
No high-profile vulnerabilities	✅	✅		No Change
No outdated base images	✅	✅		No Change
No unapproved base images	✅	✅		No Change
Supply chain attestations	✅	✅		No Change