Update GitHub Actions workflows

[MGaetan89]

Pull request

Description

This PR updates the GitHub Actions workflows.

Changes made

• Merge the Dokka workflow into the release one. This way, the published API documentation always reflects the latest stable release of Pillarbox.
• Only use Gradle's cache in the release workflow. It is discouraged to use Gradle's cache and actions/setup-java cache at the same time.
• Make the cache read-only in the release workflow. Since it runs only once in a while, there's no benefit in storing any output from this workflow.
• Add read-only cache support to the "Build on Windows" workflow. This may improve its build time without storing any additional data.
• Make the cache read-only is the nightly workflow. Since it runs in the middle of the night, we don't care for the small performance boost provided by the cache, but we may gain some storage space.
• Rename the "Build" workflow to "Quality", since it's doing more than just building the project.
• Add missing names on some steps and align the naming between all workflows, for clarity:

Before	After

Checklist

• APIs have been properly documented (if relevant).
• The documentation has been updated (if relevant).
• New unit tests have been written (if relevant).
• The demo has been updated (if relevant).

[github-actions]

Code Coverage

Overall Project	48.65%	🟢

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[StaehliJ]

Sounds good