Add official Docker image #40

.dockerignore

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+.git
+target
+assets
+fixtures

.github/workflows/docker.yml

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+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "v*" # Push events to matching v*, i.e. v1.0, v20.15.10
+
+name: Publish Docker Image
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Publish to Registry
+        uses: elgohr/Publish-Docker-Github-Action@3.01
+        with:
+          name: lycheeverse/lychee
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+          snapshot: true
+          tag_semver: true

Dockerfile

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+FROM rust:latest as builder
+
+RUN USER=root cargo new --bin lychee
+WORKDIR /lychee
+
+# Just copy the Cargo.toml and trigger a build so 
+# that we compile our dependencies only.
+# This way we avoid layer cache invalidation
+# if our dependencies haven't changed,
+# resulting in faster builds.
+COPY Cargo.toml Cargo.toml
+RUN cargo build --release
+RUN rm src/*.rs
+
+# Copy the source code and run the build again.
+# This should only compile lychee itself as the
+# dependencies were already built above.
+ADD . ./
+RUN rm ./target/release/deps/lychee*
+RUN cargo build --release
+
+
+# Our production image starts here, which uses 
+# the files from the builder image above.
+FROM debian:buster-slim
+ARG APP=/usr/src/lychee
+
+RUN apt-get update \
+    && apt-get install -y ca-certificates tzdata \
+    && rm -rf /var/lib/apt/lists/*
+
+ENV TZ=Etc/UTC \
+    APP_USER=lychee
+
+RUN groupadd $APP_USER \
+    && useradd -g $APP_USER $APP_USER \
+    && mkdir -p ${APP}
+
+COPY --from=builder /lychee/target/release/lychee ${APP}/lychee
+
+RUN chown -R $APP_USER:$APP_USER ${APP}
+
+USER $APP_USER
+WORKDIR ${APP}
+
+ENTRYPOINT [ "./lychee" ]

Makefile

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+# Needed SHELL since I'm using zsh
+SHELL := /bin/bash
+IMAGE_NAME := "lycheeverse/lychee"
+
+.PHONY: help
+help: ## This help message
+	@echo -e "$$(grep -hE '^\S+:.*##' $(MAKEFILE_LIST) | sed -e 's/:.*##\s*/:/' -e 's/^\(.\+\):\(.*\)/\\x1b[36m\1\\x1b[m:\2/' | column -c2 -t -s :)"
+
+.PHONY: docker-build
+docker-build: ## Build Docker image
+	docker build -t $(IMAGE_NAME) .
+
+.PHONY: docker-run
+docker-run: ## Run Docker image
+	docker run $(IMAGE_NAME)
+
+.PHONY: docker-push
+docker-push: ## Push image to Docker Hub
+	docker push $(IMAGE_NAME)
+
+.PHONY: build-local
+build: ## Build Rust code locally
+	cargo build
+
+.PHONY: run
+run: ## Run Rust code locally
+	cargo run