[Snyk] Security upgrade node from current-alpine to 17.8-alpine3.15

[snyk-bot]

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• single-container/Dockerfile

We recommend upgrading to node:17.8-alpine3.15, as this image has only 0 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	567	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-ALPINE315-LIBRETLS-2428776	No Known Exploit

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