anchor.diff:  ARG FUSEOVERLAYFS_VERSION=v1.2.0
   ARG STARGZ_SNAPSHOTTER_VERSION=3a04e4c2c116c85b4b66d01945cf7ebcb7a2eb5a
   
  +ARG ALPINE_VERSION=3.12
  +
   # git stage is used for checking out remote repository sources
  -FROM --platform=$BUILDPLATFORM alpine AS git
  +FROM --platform=$BUILDPLATFORM alpine:${ALPINE_VERSION} AS git
   RUN apk add --no-cache git xz
   
   # xgo is a helper for golang cross-compilation
  
positive.code:   && cp src/newuidmap src/newgidmap /usr/bin
  
  # Rootless mode.
  FROM alpine:3.12 AS rootless
  RUN apk add --no-cache fuse3 git xz pigz
  COPY --from=idmap /usr/bin/newuidmap /usr/bin/newuidmap
  COPY --from=idmap /usr/bin/newgidmap /usr/bin/newgidmap
  
negative.code: 
  FROM binaries-$TARGETOS AS binaries
  
  FROM --platform=$BUILDPLATFORM alpine:${ALPINE_VERSION} AS releaser
  RUN apk add --no-cache tar gzip
  WORKDIR /work
  ARG TARGETPLATFORM
  