Debian

# syntax=docker/dockerfile:1.6
FROM debian:bookworm-slim

RUN --mount=type=secret,id=rootio_api_key \
    DEBIAN_FRONTEND=noninteractive apt-get update && \
    # Install dependencies for adding repositories
    apt-get install -y --no-install-recommends gnupg ca-certificates && \
    \
    # Initialize keyring and add Root.io GPG key
    mkdir -p /etc/apt/keyrings && \
    echo "LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptRE1FYVlIQ1dSWUpLd1lCQkFIYVJ3OEJBUWRBcDdXVHNLMTVrWTNmQ0pxOUNRVnlxODluRzFoNEw4OHZvVndqCnB0NGNXSjYwSkZKdmIzUXVhVzhnUVZCVUlGSmxjRzl6YVhSdmNua2dQR0Z3ZEVCeWIyOTBMbWx2UG9pVEJCTVcKQ2dBN0ZpRUUzSVVhWTlLRDFsTUhKYTdNZ09RM004RHd3c2tGQW1tQndsa0NHd01GQ3drSUJ3SUNJZ0lHRlFvSgpDQXNDQkJZQ0F3RUNIZ2NDRjRBQUNna1FnT1EzTThEd3dzbGY2d0QrSWxqSGRkVmFKM2xKYjBsSE0rZVFubWNvCnlmTTlpWis5cXI0SjBNYnZsNG9CQUtOL0pYZkJvR2JGYzgzM0ZmN1I5R3M5UXU2bm1EUVZlSDI4eHEwdDRwWU4KPWs3ZHMKLS0tLS1FTkQgUEdQIFBVQkxJQyBLRVkgQkxPQ0stLS0tLQo=" \
    | base64 -d | gpg --dearmor -o /etc/apt/keyrings/rootio.gpg && \
    \
    # Write API key to auth.conf.d (never embedded in the source URL)
    mkdir -p /etc/apt/auth.conf.d && \
    printf "machine pkg.root.io\nlogin root\npassword %s\n" \
    "$(cat /run/secrets/rootio_api_key)" > /etc/apt/auth.conf.d/rootio.conf && \
    chmod 600 /etc/apt/auth.conf.d/rootio.conf && \
    \
    # Add Root.io APT repository
    echo "deb [signed-by=/etc/apt/keyrings/rootio.gpg] https://pkg.root.io/debian/bookworm bookworm main" \
    > /etc/apt/sources.list.d/rootio.list && \
    \
    DEBIAN_FRONTEND=noninteractive apt-get update && \
    \
    # Install packages, preferring Root.io patched versions when available
    for pkg in curl git openssl wget bash tini; do \
    if apt-cache show "rootio-$pkg" >/dev/null 2>&1; then \
    apt-get install -y --no-install-recommends "rootio-$pkg"; \
    else \
    apt-get install -y --no-install-recommends "$pkg"; \
    fi; \
    done && \
    \
    # Remove credentials and clean up
    rm -f /etc/apt/auth.conf.d/rootio.conf && \
    rm -rf /var/lib/apt/lists/*

CMD ["/bin/bash"]

export ROOTIO_API_KEY="your-api-token"

DOCKER_BUILDKIT=1 docker build \
  --secret id=rootio_api_key,env=ROOTIO_API_KEY \
  -t my-app:latest .