add docker install and usage flow

.dockerignore

@@ -0,0 +1,9 @@
+*
+!Dockerfile
+!.dockerignore
+!cabal.project
+!openleetcode.cabal
+!cli/
+!cli/**
+!core/
+!core/**

.github/workflows/ci.yml

@@ -71,13 +71,36 @@ jobs:
 
           Copy-Item $exe.FullName "artifacts/${{ matrix.artifact }}.exe"
 
+      - name: Smoke test executable
+        if: runner.os != 'Windows'
+        run: |
+          ./artifacts/${{ matrix.artifact }} --version
+
+      - name: Smoke test executable
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: |
+          .\artifacts\${{ matrix.artifact }}.exe --version
+
       - name: Upload artifacts
         uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.artifact }}
           path: artifacts/*
           if-no-files-found: error
 
+  build-container:
+    name: Build container
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build image
+        run: docker build -t openleetcode:test .
+
+      - name: Smoke test
+        run: docker run --rm openleetcode:test --version
+
   discover-test-ranges:
     name: Discover test ranges
     runs-on: ubuntu-latest

Dockerfile

@@ -0,0 +1,27 @@
+FROM haskell:9.8-slim-bullseye AS build
+
+WORKDIR /src
+
+COPY cabal.project openleetcode.cabal ./
+COPY cli ./cli
+COPY core ./core
+
+RUN cabal update \
+    && cabal build exe:openleetcode \
+    && exe="$(find dist-newstyle -type f -path '*/x/openleetcode/build/openleetcode/openleetcode' | head -n 1)" \
+    && test -n "$exe" \
+    && install -D "$exe" /out/openleetcode
+
+FROM debian:bullseye-slim
+
+LABEL org.opencontainers.image.source="https://github.com/therepanic/openleetcode"
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates libgmp10 \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=build /out/openleetcode /usr/local/bin/openleetcode
+
+ENTRYPOINT ["openleetcode"]

README.md

@@ -31,7 +31,7 @@ $ openleetcode submit ./solution.rs --title two-sum
 
 ## Install
 
-You need Docker for the execution backend. On Linux and macOS the installer will try to start the default Piston backend for you through Docker Compose.
+You need Docker for the execution backend. On Linux and macOS the installer will try to start the default Piston backend for you through Docker Compose. On Windows, the installer only installs the CLI. Bring Docker yourself and start the backend manually.
 
 Linux and macOS:
 
@@ -45,7 +45,16 @@ Windows PowerShell:
 irm https://raw.githubusercontent.com/therepanic/openleetcode/main/install.ps1 | iex
 ```
 
-On Windows, the installer only installs the CLI. Bring Docker yourself and start the backend manually.
+Docker:
+
+```sh
+curl -fsSL https://raw.githubusercontent.com/therepanic/openleetcode/main/openleetcode.yml -o openleetcode.yml
+curl -fsSL https://raw.githubusercontent.com/therepanic/openleetcode/main/backends/piston/docker-compose.yml -o piston.yml
+docker compose -f piston.yml up -d
+docker compose -f openleetcode.yml -f piston.yml run --rm openleetcode --version
+```
+
+The backend may take a while to install runtimes on the first start.
 
 ## Backend
 

backends/piston/docker-compose.yml

@@ -1,6 +1,10 @@
 services:
   piston:
     image: ghcr.io/engineer-man/piston:latest
+    networks:
+      default:
+        aliases:
+          - backend
     container_name: piston
     restart: unless-stopped
     privileged: true

openleetcode.yml

@@ -0,0 +1,13 @@
+services:
+  openleetcode:
+    image: ghcr.io/therepanic/openleetcode:latest
+    stdin_open: true
+    tty: true
+    volumes:
+      - ./:/app
+      - openleetcode_data:/root/.config/openleetcode
+    environment:
+      OPENLEETCODE_BACKEND_URL: "http://backend:2000"
+
+volumes:
+  openleetcode_data: