feat: add container image support

.dockerignore

@@ -0,0 +1,6 @@
+.git
+.github
+node_modules
+dist
+coverage
+*.log

Dockerfile

@@ -0,0 +1,34 @@
+ARG NODE_IMAGE=docker.io/library/node:24-bookworm-slim
+
+FROM ${NODE_IMAGE} AS build
+
+WORKDIR /opt/torlink
+
+COPY . .
+RUN npm ci \
+    && npm run build \
+    && npm prune --omit=dev
+
+FROM ${NODE_IMAGE} AS runtime
+
+ENV NODE_ENV=production \
+    HOME=/home/node \
+    TORLINK_STATE_DIR=/state \
+    TORLINK_NO_UPDATE_CHECK=1
+
+WORKDIR /opt/torlink
+
+COPY --from=build --chown=node:node /opt/torlink/package.json ./package.json
+COPY --from=build --chown=node:node /opt/torlink/dist ./dist
+COPY --from=build --chown=node:node /opt/torlink/node_modules ./node_modules
+
+# Keep writable paths usable when the runtime assigns an arbitrary UID in GID 0.
+RUN install -d -o 1000 -g 0 /state /home/node/Downloads/torlink \
+    && chmod -R g=u /state /home/node/Downloads/torlink
+
+USER 1000
+
+VOLUME ["/state", "/home/node/Downloads/torlink"]
+EXPOSE 9160 9161
+
+ENTRYPOINT ["node", "/opt/torlink/dist/cli.cjs"]

README.md

@@ -60,6 +60,47 @@ torlink also runs without the TUI, for servers and seedboxes:
 
 Add `--daemon` to keep watch, serve, or files running after you log out; `torlnk --help` has the full list of modes and flags.
 
+## Container with Docker
+
+Build the image:
+
+```sh
+docker build -t torlink .
+```
+
+Run it with persistent state and downloads:
+
+```sh
+mkdir -p "$HOME/.local/share/torlink" "$HOME/Downloads/torlink"
+docker run --rm -it \
+  -v "$HOME/.local/share/torlink:/state" \
+  -v "$HOME/Downloads/torlink:/home/node/Downloads/torlink" \
+  torlink
+```
+
+The multi-stage image uses Node 24 LTS and runs torlink as an unprivileged user.
+
+## Container with Podman
+
+Build the image:
+
+```sh
+podman build -t torlink .
+```
+
+Run it with persistent state and downloads. `--userns=keep-id` makes files created in the bind mounts belong to your host user:
+
+```sh
+mkdir -p "$HOME/.local/share/torlink" "$HOME/Downloads/torlink"
+podman run --rm -it \
+  --userns=keep-id \
+  -v "$HOME/.local/share/torlink:/state:Z" \
+  -v "$HOME/Downloads/torlink:/home/node/Downloads/torlink:Z" \
+  torlink
+```
+
+The `:Z` suffix gives the bind mounts a private SELinux label. It can be omitted on systems without SELinux.
+
 ## Contributing
 
 To run or work on torlink locally: