FROM --platform=linux/amd64 ubuntu:20.04@sha256:33a5cc25d22c45900796a1aca487ad7a7cb09f09ea00b779e3b2026b4fc2faba
RUN apt update -y && apt install make python3 curl unzip -y
RUN LATEST_VERSION=$(curl https://api.github.com/repos/sigstore/cosign/releases/latest | grep tag_name | cut -d : -f2 | tr -d "v\", ") && \
    curl -O -L "https://github.com/sigstore/cosign/releases/latest/download/cosign_${LATEST_VERSION}_amd64.deb" && \
    dpkg -i cosign_${LATEST_VERSION}_amd64.deb