Redesign Github workflows

[FooBarWidget]

• Have a single test-and-build workflow for testing everything as well as building the API server. Get rid of the separate "build API server" workflow.
• Have the deploy workflow trigger based on successful completion of API server build on the main branch.
• Syntax check Ansible.
• Security audit workflows using zizmor — thanks TanStack for the tip.
• Make test-and-build workflow compatible with pull requests.
• Enforce timeouts.

[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

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• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.