Add fpm experiment

fpm/.gitignore

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+.ninja_log

fpm/Containerfile

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+# syntax=docker/dockerfile:1
+ARG CONTAINER_REGISTRY=docker.io
+
+FROM $CONTAINER_REGISTRY/ubuntu:jammy-20231004 as system-ruby
+RUN <<EOF
+  apt-get update
+  apt-get install --no-install-recommends --no-install-suggests -y \
+    'ruby=*'
+  rm -rf /var/lib/apt/lists/*
+EOF
+
+FROM system-ruby
+
+ENV GEM_PATH=/fpm
+ENV PATH="/fpm/bin:${PATH}"
+RUN <<EOF
+  useradd --create-home --shell /bin/bash fpm
+  gem install --no-document --install-dir=/fpm fpm:1.15.1
+EOF
+
+USER fpm
+WORKDIR /src
+ENTRYPOINT ["/fpm/bin/fpm"]
+CMD ["-h"]

fpm/README.md

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+# fpm

fpm/build.ninja

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+rule lint
+  command = docker container run --rm -i docker.io/boxcutter/hadolint hadolint - < Containerfile 
+
+build lint: lint

fpm/docker-bake.hcl

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+variable "LOCAL_PLATFORM" {
+  default="${BAKE_LOCAL_PLATFORM}" == "darwin/arm64/v8" ? "linux/arm64/v8" : "${BAKE_LOCAL_PLATFORM}"
+}
+
+target "local" {
+  dockerfile = "Containerfile"
+  tags= [
+    "docker.io/boxcutter/fpm:latest"
+  ]
+  platforms = ["${LOCAL_PLATFORM}"]
+}
+
+target "default" {
+  dockerfile = "Containerfile"
+  tags= [
+    "docker.io/boxcutter/fpm:latest"
+  ]
+  platforms = ["linux/amd64", "linux/arm64/v8"]
+}