Add docker image

.dockerignore

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+target
+.github

.github/workflows/ci.yml

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-name: Continuous integration
+name: continuous-integration
 
 on:
   pull_request:

.github/workflows/deploy.yml

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+name: deploy
+
+on:
+  push:
+    branches:    
+      - master
+
+jobs:
+  build-push-docker-image:
+    name: Build and push passive node Docker image
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Push to GitHub Packages
+      uses: docker/build-push-action@v1
+      with:
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+        registry: docker.pkg.github.com
+        repository: tomaka/substrate-lite/node
+        tag_with_ref: true

Dockerfile

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+FROM rust:1 AS builder
+LABEL maintainer "Pierre Krieger <[email protected]>"
+
+COPY . /build
+WORKDIR /build
+
+RUN apt-get update && apt-get install -y musl-tools
+# TODO: don't use nightly once possible
+RUN rustup default nightly
+RUN rustup target add x86_64-unknown-linux-musl
+RUN cargo build --target x86_64-unknown-linux-musl --bin node --release --verbose --all-features
+
+
+FROM alpine:latest
+LABEL maintainer "Pierre Krieger <[email protected]>"
+COPY --from=builder /build/target/x86_64-unknown-linux-musl/release/node /usr/local/bin
+
+EXPOSE 30333
+CMD ["/usr/local/bin/node"]