Consider building Flowfuse container image as a part of `FlowFuse/flowfuse`

[ppawlowski]

This task aims to collect opinions about the idea. Prpper tasks should be created once decision is made.

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At this moment the flow for building flowfuse app used by the FFC is:

1. Update the code within FlowFuse/flowfuse repo
2. Build the npm package (nightly)
3. Trigger container build in FlowFuse/helm repo
4. Update container image and trigger FFC deployment workflow in FlowFuse/CloudProject

Running container image build as a part of FlowFuse/flowfuse will:

• shorten the delivery time
• simplifies FFC deployment tracking
• decrease the management burden

Also, keeping contianer image build next to the application code is a common approach.

Same approach could be made to fileServer container image.