Extremely simple; no extra tools like curl required. Cons: It doesn't support authentication and offers no control over the download process (like retries). 2. Using curl or wget (Recommended)
# syntax=docker/dockerfile:1 FROM eclipse-temurin:17-jdk-alpine RUN apk add --no-cache curl # Safely using a token to download from a private source RUN --mount=type=secret,id=netrc,target=/root/.netrc \ curl -n -L https://private-repo.com -o /app.jar Use code with caution. 4. Multi-Stage Builds (The Pro Approach) download jar in dockerfile
To keep your image size small, always combine the download and cleanup in one RUN instruction: dockerfile Extremely simple; no extra tools like curl required