Vendor opencode source for docker build

opencode/packages/containers/README.md

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+# CI containers
+
+Prebuilt images intended to speed up GitHub Actions jobs by baking in
+large, slow-to-install dependencies. These are designed for Linux jobs
+that can use `job.container` in workflows.
+
+Images
+
+- `base`: Ubuntu 24.04 with common build tools and utilities
+- `bun-node`: `base` plus Bun and Node.js 24
+- `rust`: `bun-node` plus Rust (stable, minimal profile)
+- `tauri-linux`: `rust` plus Tauri Linux build dependencies
+- `publish`: `bun-node` plus Docker CLI and AUR tooling
+
+Build
+
+```
+REGISTRY=ghcr.io/anomalyco TAG=24.04 bun ./packages/containers/script/build.ts
+REGISTRY=ghcr.io/anomalyco TAG=24.04 bun ./packages/containers/script/build.ts --push
+```
+
+Workflow usage
+
+```
+jobs:
+  build-cli:
+    runs-on: ubuntu-latest
+    container:
+      image: ghcr.io/anomalyco/build/bun-node:24.04
+```
+
+Notes
+
+- These images only help Linux jobs. macOS and Windows jobs cannot run
+  inside Linux containers.
+- `--push` publishes multi-arch (amd64 + arm64) images using Buildx.
+- If a job uses Docker Buildx, the container needs access to the host
+  Docker daemon (or `docker-in-docker` with privileged mode).