Adds docker image publishing (#14)

Uses envsubst in an entrypoint script to make injecting secrets (e.g. db
password and access_key_secret) easier.

Co-authored-by: Noah Kennedy <Nomaxx117@gmail.com>

Author: will118

.github/workflows/on-release.yaml

@@ -0,0 +1,42 @@
+name: Publish Docker image
+
+on:
+  release:
+    types: [published]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@f2a1d5e99d037542a71f64918e516c093c6f3fc4
+        with:
+          context: .
+          file: docker/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

docker/Dockerfile

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+FROM rust:1.71-bullseye as builder
+WORKDIR /usr/src/freighter
+
+COPY Cargo.toml .
+COPY Cargo.lock .
+COPY .cargo/ .cargo
+COPY freighter/ freighter
+COPY freighter-auth/ freighter-auth
+COPY freighter-index/ freighter-index
+COPY freighter-server/ freighter-server
+COPY freighter-storage/ freighter-storage
+
+RUN cd freighter \
+  && cargo install --path .
+
+FROM debian:bullseye-slim
+COPY --from=builder /usr/local/cargo/bin/freighter /usr/local/bin/freighter
+
+RUN apt-get update \
+  && apt-get install -y gettext-base \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY docker/entrypoint.sh .
+COPY docker/config.yaml.tpl .
+
+# Create file so it can be written in entrypoint
+RUN touch config.yaml && chown nobody:nogroup config.yaml
+
+USER nobody:nogroup
+
+ENTRYPOINT ["/entrypoint.sh"]

docker/config.yaml.tpl

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+service:
+  address: "$SERVER_ADDR"
+  download_endpoint: "$DOWNLOAD_ENDPOINT"
+  api_endpoint: "$API_ENDPOINT"
+  metrics_address: "$METRICS_ADDR"
+
+index_db: &db
+  dbname: "$POSTGRES_DBNAME"
+  user: "$POSTGRES_USER"
+  password: "$POSTGRES_PASSWORD"
+  host: "$POSTGRES_HOST"
+  port: $POSTGRES_PORT
+
+auth_db: *db
+
+store:
+  name: "$BUCKET_NAME"
+  endpoint_url: "$BUCKET_ENDPOINT"
+  region: "us-east-1"
+  access_key_id: "$BUCKET_ACCESS_KEY_ID"
+  access_key_secret: "$BUCKET_ACCESS_KEY_ID"

docker/entrypoint.sh

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+#!/bin/sh
+
+# Freighter Server
+export SERVER_ADDR="${SERVER_ADDR:-127.0.0.1:3000}"
+export DOWNLOAD_ENDPOINT="${DOWNLOAD_ENDPOINT:-"$SERVER_ADDR/downloads/{crate}/{version}"}"
+export API_ENDPOINT="${API_ENDPOINT:-"$SERVER_ADDR"}"
+export METRICS_ADDR="${METRICS_ADDR:-127.0.0.1:3001}"
+
+# PostgreSQL
+export POSTGRES_HOST="${POSTGRES_HOST:?\$POSTGRES_HOST required}"
+export POSTGRES_PORT="${POSTGRES_PORT:-5432}"
+export POSTGRES_USER="${POSTGRES_USER:?\$POSTGRES_USER required}"
+export POSTGRES_PASSWORD="${POSTGRES_PASSWORD:?\$POSTGRES_PASSWORD required}"
+export POSTGRES_DBNAME="${POSTGRES_DBNAME:-freighter}"
+
+# S3 Storage
+export BUCKET_NAME="${BUCKET_NAME:?\$BUCKET_NAME required}"
+export BUCKET_ENDPOINT="${BUCKET_ENDPOINT:?\$BUCKET_ENDPOINT required}"
+export BUCKET_ACCESS_KEY_ID="${BUCKET_ACCESS_KEY_ID:?\$BUCKET_ACCESS_KEY_ID required}"
+export BUCKET_ACCESS_KEY_SECRET="${BUCKET_ACCESS_KEY_SECRET:?\$BUCKET_ACCESS_KEY_SECRET required}"
+
+envsubst < "config.yaml.tpl" > "config.yaml"
+
+exec freighter -c config.yaml