.github,docker/unified: improve caching and fix bugs

[mostlygeek]

• set up a GHA scheduled job to build the container nightly
• enabling pushing a llama-swap:unified and a llama-swap:unified-Y-M-D image to ghcr.io
• tidy up Dockerfile to use a non-root user and llama-swap as an entry point

[coderabbitai]

Walkthrough

The PR updates the unified Docker workflow and build pipeline to use master/main branches as defaults for dependencies, enables Container Registry publishing in CI/CD environments (excluding local test runs), refactors version resolution to work with commit hashes and GitHub tags, introduces configuration management via example YAML, and changes the container entrypoint from interactive bash to the llama-swap service.

Changes

Cohort / File(s)	Summary
Workflow Configuration .github/workflows/unified-docker.yml	Added cron-based scheduling trigger, updated workflow_dispatch input defaults to "master" and "main", enabled Container Registry login and publishing steps (conditional on non-local environments), adjusted environment variable fallbacks for missing inputs, and enhanced publish logic with UTC date-suffixed image tagging.
Container Runtime docker/unified/Dockerfile	Created dedicated llama-swap system user with config directory ownership, removed symlink creation and executable validation loop, changed entrypoint from bash to llama-swap service with config path and port binding, and added config example file copy.
Build Infrastructure docker/unified/build-image.sh, docker/unified/install-llama-swap.sh	Added LLAMA_SWAP_REPO variable, replaced version resolution with commit-hash detection and GitHub tag resolution via git ls-remote, updated Docker build arguments to pass resolved hashes, integrated registry caching for non-local GitHub Actions builds, and adjusted container invocations with explicit entrypoints.
Configuration docker/unified/config.example.yaml	New example configuration file defining service options (healthCheckTimeout, logRequests) and three model entries (llama, whisper, image) with commands and endpoint checks.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• docker/unified: add cuda based unified container #597: Introduced the unified-docker feature; this PR continues and modifies the same files with updated build/publish logic and version resolution.
• Improve container workflow and build script #457: Modified container build workflows and llama-swap version resolution logic with tag/hash-fetching and workflow trigger adjustments.
• feat: Add support for custom llama.cpp base image and forked llama-swap repositories #396: Parameterized llama-swap repository and version through build arguments and resolution functions.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main changes: improving caching and fixing bugs in GitHub Actions and Docker unified container.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description accurately relates to the changeset, covering the three main areas: scheduled GHA builds, GHCR image publishing, and Dockerfile cleanup with non-root user and entrypoint.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch unified-container-improvements

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