Add scripts/files used to generate https://hub.docker.com/r/tianon/gosu

hub/Dockerfile.alpine

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+FROM alpine:3.13
+
+# https://github.com/tianon/gosu/releases
+ENV GOSU_VERSION 1.12
+
+RUN set -eux; \
+	apk add --no-cache --virtual .fetch-deps dpkg gnupg; \
+	dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
+	wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
+	wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
+	GNUPGHOME="$(mktemp -d)"; export GNUPGHOME; \
+	gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
+	gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
+	gpgconf --kill all; \
+	rm -rf "$GNUPGHOME"; unset GNUPGHOME; \
+	apk del --no-network .fetch-deps; \
+	chmod +x /usr/local/bin/gosu; \
+	gosu --version; \
+	gosu nobody true; \
+# hard link to / for ease of COPY --from
+	ln -v /usr/local/bin/gosu /

hub/Dockerfile.debian

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+FROM debian:buster-slim
+
+# https://github.com/tianon/gosu/releases
+ENV GOSU_VERSION 1.12
+
+RUN set -eux; \
+	savedAptMark="$(apt-mark showmanual)"; \
+	apt-get update; \
+	apt-get install -y --no-install-recommends ca-certificates dirmngr gnupg wget; \
+	rm -rf /var/lib/apt/lists/*; \
+	dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
+	wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
+	wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
+	GNUPGHOME="$(mktemp -d)"; export GNUPGHOME; \
+	gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
+	gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
+	gpgconf --kill all; \
+	rm -rf "$GNUPGHOME"; unset GNUPGHOME; \
+	apt-mark auto '.*' > /dev/null; \
+	[ -z "$savedAptMark" ] || apt-mark manual $savedAptMark > /dev/null; \
+	apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
+	chmod +x /usr/local/bin/gosu; \
+	gosu --version; \
+	gosu nobody true; \
+# hard link to / for ease of COPY --from
+	ln -v /usr/local/bin/gosu /

hub/alpine.yml

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+image: tianon/gosu:alpine
+manifests:
+  - { image: tianon/gosu:alpine-amd64, platform: { os: linux, architecture: amd64 } }
+  - { image: tianon/gosu:alpine-arm32v6, platform: { os: linux, architecture: arm, variant: v6 } }
+  - { image: tianon/gosu:alpine-arm32v7, platform: { os: linux, architecture: arm, variant: v7 } }
+  - { image: tianon/gosu:alpine-arm64v8, platform: { os: linux, architecture: arm64, variant: v8 } }
+  - { image: tianon/gosu:alpine-i386, platform: { os: linux, architecture: 386 } }
+  - { image: tianon/gosu:alpine-ppc64le, platform: { os: linux, architecture: ppc64le } }
+  - { image: tianon/gosu:alpine-s390x, platform: { os: linux, architecture: s390x } }

hub/build.sh

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+#!/usr/bin/env bash
+set -Eeuo pipefail
+
+declare -A platforms=(
+	[amd64]='linux/amd64'
+	[arm32v5]='linux/arm/v5'
+	[arm32v6]='linux/arm/v6'
+	[arm32v7]='linux/arm/v7'
+	[arm64v8]='linux/arm64/v8'
+	[i386]='linux/386'
+	[mips64le]='linux/mips64le'
+	[ppc64le]='linux/ppc64le'
+	[s390x]='linux/s390x'
+)
+
+declare -A arches=(
+	[alpine]='amd64 arm32v6 arm32v7 arm64v8 i386 ppc64le s390x'
+	[debian]='amd64 arm32v5 arm32v7 arm64v8 i386 mips64le ppc64le s390x'
+)
+preferredOrder=( alpine debian )
+
+_platformToOCI() {
+	local platform="$1"; shift
+	local os="${platform%%/*}"
+	platform="${platform#$os/}"
+	local architecture="${platform%%/*}"
+	platform="${platform#$architecture/}"
+	local variant="$platform"
+	[ "$architecture" != "$variant" ] || variant=
+	echo "{ os: $os, architecture: $architecture${variant:+, variant: $variant} }"
+}
+
+declare -A latest=()
+for variant in "${preferredOrder[@]}"; do
+	cat > "$variant.yml" <<-EOYAML
+		image: tianon/gosu:$variant
+		manifests:
+	EOYAML
+	for arch in ${arches[$variant]}; do
+		platform="${platforms[$arch]}"
+		docker build --pull --platform "$platform" --tag "tianon/gosu:$variant-$arch" - < "Dockerfile.$variant"
+		: "${latest[$arch]:=$variant}"
+		platform="$(_platformToOCI "$platform")"
+		echo "  - { image: tianon/gosu:$variant-$arch, platform: $platform }" >> "$variant.yml"
+	done
+done
+
+cat > latest.yml <<-'EOYAML'
+	image: tianon/gosu:latest
+	manifests:
+EOYAML
+for arch in "${!latest[@]}"; do
+	variant="${latest[$arch]}"
+	docker tag "tianon/gosu:$variant-$arch" "tianon/gosu:$arch"
+	platform="$(_platformToOCI "${platforms[$arch]}")"
+	echo "  - { image: tianon/gosu:$arch, platform: $platform }" >> latest.yml
+done
+
+echo
+echo '$ # now:'
+echo
+echo '$ docker push --all-tags tianon/gosu'
+for variant in "${preferredOrder[@]}" latest; do
+	echo "\$ manifest-tool push from-spec $variant.yml"
+done

hub/debian.yml

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+image: tianon/gosu:debian
+manifests:
+  - { image: tianon/gosu:debian-amd64, platform: { os: linux, architecture: amd64 } }
+  - { image: tianon/gosu:debian-arm32v5, platform: { os: linux, architecture: arm, variant: v5 } }
+  - { image: tianon/gosu:debian-arm32v7, platform: { os: linux, architecture: arm, variant: v7 } }
+  - { image: tianon/gosu:debian-arm64v8, platform: { os: linux, architecture: arm64, variant: v8 } }
+  - { image: tianon/gosu:debian-i386, platform: { os: linux, architecture: 386 } }
+  - { image: tianon/gosu:debian-mips64le, platform: { os: linux, architecture: mips64le } }
+  - { image: tianon/gosu:debian-ppc64le, platform: { os: linux, architecture: ppc64le } }
+  - { image: tianon/gosu:debian-s390x, platform: { os: linux, architecture: s390x } }

hub/latest.yml

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+image: tianon/gosu:latest
+manifests:
+  - { image: tianon/gosu:mips64le, platform: { os: linux, architecture: mips64le } }
+  - { image: tianon/gosu:arm32v5, platform: { os: linux, architecture: arm, variant: v5 } }
+  - { image: tianon/gosu:arm32v6, platform: { os: linux, architecture: arm, variant: v6 } }
+  - { image: tianon/gosu:arm32v7, platform: { os: linux, architecture: arm, variant: v7 } }
+  - { image: tianon/gosu:arm64v8, platform: { os: linux, architecture: arm64, variant: v8 } }
+  - { image: tianon/gosu:s390x, platform: { os: linux, architecture: s390x } }
+  - { image: tianon/gosu:ppc64le, platform: { os: linux, architecture: ppc64le } }
+  - { image: tianon/gosu:i386, platform: { os: linux, architecture: 386 } }
+  - { image: tianon/gosu:amd64, platform: { os: linux, architecture: amd64 } }