Update workflows

[digitaldogsbody]

Purpose

This PR refactors the github workflows to bring them in line with the patterns used in Lupo - allowing proper deployment of branches to staging via workflow run (previously broken), adding linting to all relevant workflows and enabling full support for dependabot PRs to be tested to allow quick merge.

NB: Linting is temporarily disabled as there are a lot of issues that Rubocop has found, but they should be fixed separately to this PR

closes: #145
obsoletes: #151

Approach

Open Questions and Pre-Merge TODOs

Learning

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

Reviewer, please remember our guidelines:

• Be humble in the language and feedback you give, ask don't tell.
• Consider using positive language as opposed to neutral when offering feedback. This is to avoid the negative bias that can occur with neutral language appearing negative.
• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
• Ensure you give reasons for the changes you are proposing.