optimise test github action

[pindge]

Proposed changes

the current test github action workflow isn't working correctly. This pr fixes and optimises the following:

• the s3-to-dc command is only available in index image,
• the setup_test_datacube.sh need to be mounted to index container
• execute the setup_test_datacube.sh from the container directly
• directly execute s3-to-dc command in setup_test_datacube.sh
• clone the latest dea-config to load all the product metadata and metadata type

Closes issues (optional)

• Closes Issue docker-compose relies on out of date setup #918

Checklist (replace [ ] with [x] to check off)

• Notebook created using the DEA-notebooks template
• Remove any unused Python packages from Load packages
• Remove any unused/empty code cells
• Remove any guidance cells (e.g. General advice)
• Ensure that all code cells follow the PEP8 standard for code. The jupyterlab_code_formatter tool can be used to format code cells to a consistent style: select each code cell, then click Edit and then one of the Apply X Formatter options (YAPF or Black are recommended).
• Include relevant tags in the final notebook cell (refer to the DEA Tags Index, and re-use tags if possible)
• Clear all outputs, run notebook from start to finish, and save the notebook in the state where all cells have been sequentially evaluated
• Test notebook on both the NCI and DEA Sandbox (flag if not working as part of PR and ask for help to solve if needed)
• If applicable, update the Notebook currently compatible with the NCI|DEA Sandbox environment only line below the notebook title to reflect the environments the notebook is compatible with

[review-notebook-app]

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[robbibt]

This is fantastic, thanks @pindge!