Auto-update Node.js version in Dockerfiles

[bajtos]

Review all CheckerNetwork repositories and ensure they are set up to allow Dependeabot to automatically update the Node.js version in the Dockerfile(s).

(1)
The Docker file must include the Node.js version in the FROM value directly. It must not use a variable.

Good:
https://github.com/CheckerNetwork/core/blob/bbf8196575d253cdb452024887939435fea4e95c/Dockerfile#L1

FROM node:22.13.1-slim

Bad:
https://github.com/CheckerNetwork/spark-api/blob/8663a79f20c49d4d9b9e9db0c246f8f1f14b0110/Dockerfile#L3-L5

# Adjust NODE_VERSION as desired
ARG NODE_VERSION=22.13.1
FROM node:${NODE_VERSION}-slim AS base

(2)
Dependabot must be configured to auto-update Docker dependencies.

Example: spark-api >> .github/dependabot.yml

[Hany-Almnaem]

All required changes for this issue have been completed

🔹 I have updated the Node.js version in the Dockerfiles and ensured Dependabot is configured for auto-updates across all relevant repositories.
🔹 Below are the pull requests for each repository:

• PR #489
• PR #687
• PR #11
• PR #1

Please let me know if you need any more changes.

[juliangruber]

@Hany-Almnaem I believe changing the Dockerfile to be nodejs version variable free isn't enough, we also need to ensure all repos have https://github.com/CheckerNetwork/spark-api/blob/8663a79f20c49d4d9b9e9db0c246f8f1f14b0110/.github/dependabot.yml#L28-L34

[Hany-Almnaem]

@juliangruber Thank you for the feedback! 🙌

Regarding Dependabot:

• Some repositories already had Dependabot configured, and I ensured they properly track Docker dependencies.
• However, I noticed that some repositories do not have Dependabot set up at all.

So, to fully resolve this issue, I will set up Dependabot in those repositories and configure it.