Add Dockerfile and github actions

.github/workflows/docker-image.yml

@@ -0,0 +1,18 @@
+name: Publish Docker image
+on:
+  release:
+    types: [published]
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+      - name: Push to Docker Hub
+        uses: docker/build-push-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          repository: ${{ secrets.DOCKER_USERNAME }}/claim-ip
+          tag_with_ref: true

Dockerfile

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+FROM rust:alpine3.13 AS buildenv
+
+COPY . /build
+WORKDIR /build
+RUN cargo build --release
+
+FROM alpine:3.13
+
+COPY --from=buildenv /build/target/release/claim-ip /usr/local/bin/
+
+ENTRYPOINT [ "claim-ip" ]