init: Coder compose + templates + act-runner

coder/templates/python-uv/README.md

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+# python-uv (minimal uv-based dev workspace)
+
+One template, intended for a **single workspace** per user (work + home projects coexist in `~/work/` and `~/home/`; `uv` gives each project its own venv).
+
+## What's in the workspace
+- Base: `ghcr.io/astral-sh/uv:bookworm-slim`
+- Python: latest stable via `uv python install` (tracks Astral's release channel)
+- code-server (browser VS Code)
+- git, curl, nano, openssh-client
+- Intel Arc renderD128 mounted at `/dev/dri/renderD128`
+
+## Persistent storage
+`$HOME` is bind-mounted from `/mnt/pve/unas/services/coder/<user>/<workspace>/` on UNAS.
+Workspace stop/rebuild is safe — files persist.
+
+## Per-project pattern
+```bash
+cd ~/work/myproj
+uv init                  # if new
+uv add fastapi uvicorn   # adds to pyproject + locks
+uv run python main.py
+```
+
+## Push template to Coder
+From a host with the Coder CLI configured:
+
+```bash
+coder templates push python-uv -d /opt/stacks/coder/templates/python-uv
+```
+
+Then in the Coder UI: **Workspaces → Create Workspace → python-uv → name it `dev`**.
+
+## Optional: dotfiles
+On workspace creation you can pass a Git URL (e.g. `https://git.nuclide.systems/fkrebs/dotfiles.git`). Coder clones it and runs `install.sh`.