Add proper signal handling for graceful shutdowns

[mikesir87]

Added signal handlers to the main script file to shutdown the app when SIGINT and SIGTERM signals are sent. Otherwise, it hangs when trying to Ctrl+C a running container.

[github-actions]

Your image	dockerdevrel/catalog-service-node:pr-30
Current base image	node:22-bookworm-slim

Policy Status

(4/7 policies met, 2 missing data)

Status	Policy	Results
✅	Default non-root user
✅	No AGPL v3 licenses	0 packages
✅	No fixable critical or high vulnerabilities
✅	No high-profile vulnerabilities
❓	No outdated base images	No data Learn more ↗
❓	No unapproved base images	No data
⚠️	Missing supply chain attestation(s)	2 deviations

[github-actions]

Overview

Image reference	dockerdevrel/catalog-service-node:latest	dockerdevrel/catalog-service-node:pr-30
- digest	b630c97cef9b	62a8e884511d
- tag	latest	pr-30
- environment	production
- provenance	781663d	1d3c2c4
- vulnerabilities
- platform	linux/amd64	linux/amd64
- size	84 MB	84 MB (+92 B)
- packages	330	330
Base Image	node:22-bookworm-slim also known as: • 22-slim • 22.13-bookworm-slim • 22.13-slim • 22.13.0-bookworm-slim • 22.13.0-slim • jod-bookworm-slim • jod-slim • lts-bookworm-slim • lts-slim	node:22-bookworm-slim also known as: • 22-slim • 22.13-bookworm-slim • 22.13-slim • 22.13.0-bookworm-slim • 22.13.0-slim • jod-bookworm-slim • jod-slim • lts-bookworm-slim • lts-slim
- vulnerabilities

Labels (3 changes)

• ± 3 changed
• 5 unchanged

-org.opencontainers.image.created=2025-01-15T22:47:28.805Z
+org.opencontainers.image.created=2025-01-16T04:18:39.997Z
 org.opencontainers.image.description=
 org.opencontainers.image.licenses=CC0-1.0
-org.opencontainers.image.revision=781663d8eeebad7825a85796e942c08bc774cbd0
+org.opencontainers.image.revision=1d3c2c4f876c8373f2589138924edf303ae40768
 org.opencontainers.image.source=https://github.com/dockersamples/catalog-service-node
 org.opencontainers.image.title=catalog-service-node
 org.opencontainers.image.url=https://github.com/dockersamples/catalog-service-node
-org.opencontainers.image.version=v0.2.0
+org.opencontainers.image.version=pr-30

Policies (0 improved, 1 worsened, 2 missing data)

Policy Name	dockerdevrel/catalog-service-node:latest	dockerdevrel/catalog-service-node:pr-30	Change	Standing
Default non-root user	✅	✅		No Change
No AGPL v3 licenses	✅	✅		No Change
No fixable critical or high vulnerabilities	✅	✅		No Change
No high-profile vulnerabilities	✅	✅		No Change
No outdated base images	✅	❓ No data
No unapproved base images	✅	❓ No data
Supply chain attestations	✅	⚠️ 2	+2	Worsened