Ensure docker containers container latest npm

[knolleary]

Description

We build our containers based on the upstream node:XX-alpine containers.

These contain an older version of npm that triggers security scan warnings.

We should update the docker build to npm install -g npm to ensure the latest version is installed.

All of the containers we build need to be updated; not just the ones in this repository, but the device-agent as well.

Our Node-RED containers are based on the community images. We should update the community images similarly for the next 4.1.x maintenance release.

• Add npm update to all Dockerfiles #305
• fix: Add npm update to all docker files helm#848
• Install npm globally in Dockerfile device-agent#604

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Tagging customer-request as this has been highlighted through a package scan provided by a customer.

[knolleary]

PRs raised against docker-compose, helm and device agent.

The upstream NR task is a nice-to-have we should complete, but the NR container Dockerfiles in our own repos will take care of it.