.github,docker/unified: include vulkan build

[mostlygeek]

Update docker/unified scripts to support building both cuda and vulkan unified images.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 99025133-1955-46a1-be59-014efb3856c5

📥 Commits

Reviewing files that changed from the base of the PR and between 2c282dc and 860ec05.

📒 Files selected for processing (6)

• .github/workflows/unified-docker.yml
• docker/unified/Dockerfile
• docker/unified/build-image.sh
• docker/unified/install-llama.sh
• docker/unified/install-sd.sh
• docker/unified/install-whisper.sh

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Walkthrough

This PR adds backend-specific build and deployment support (cuda/vulkan) across the Docker pipeline, introducing a matrix strategy in the CI workflow, backend-specific Dockerfile stages, and backend selection logic in build scripts.

Changes

Cohort / File(s)	Summary
CI Workflow .github/workflows/unified-docker.yml	Added strategy.matrix.backend with [cuda, vulkan] values. Build step labels, image tags, and push logic now include backend-specific identifiers (e.g., unified-${{ matrix.backend }}). Build script invocation passes --${{ matrix.backend }} flag. Date-stamped tags updated to unified-${backend}-${DATE_TAG} format.
Docker Image Configuration docker/unified/Dockerfile	Added BACKEND build argument (default cuda). Split builder and runtime stages into backend-specific variants (builder-base-cuda, builder-base-vulkan, runtime-cuda, runtime-vulkan). Build stages now pass BACKEND argument to install scripts and scope cache IDs by backend (e.g., ccache-${BACKEND}). Added Vulkan runtime dependencies and backend-specific PATH/ENV configuration. /versions.txt now records selected backend.
Build and Install Scripts docker/unified/build-image.sh, docker/unified/install-whisper.sh, docker/unified/install-sd.sh, docker/unified/install-llama.sh	build-image.sh now requires explicit --cuda or --vulkan flag, defaults image tag to llama-swap:unified-${BACKEND}, and passes backend-specific build arguments and cache references. Install scripts introduce BACKEND environment variable (default cuda) to conditionally enable/disable CMake features: CUDA backend enables GGML_CUDA with architecture/compiler flags; Vulkan backend enables GGML_VULKAN and disables CUDA. Vulkan runtime instructions reference /dev/dri device mapping.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• docker/unified: add cuda based unified container #597 — Introduced the foundational docker/unified/ infrastructure (Dockerfile, build scripts, CI workflow) that this PR extends with backend matrix support.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch unified-vulkan-docker-image

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