Initialize repo

Signed-off-by: Timon Wong <timon86.wang@gmail.com>

Author: timonwong

.gitignore

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+tmp/
+dist/
+manifest.json

README.md

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+# shellcheck-m1
+
+Sync homebrew'ed Apple M1 shellcheck build.

download.sh

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+#!/bin/bash
+
+set -eu
+
+SHELLCHECK_REPO=ghcr.io/homebrew/core/shellcheck
+SHELLCHECK_VERSION=0.8.0
+
+mkdir -p tmp
+
+echo "Retrieving shellcheck image manifest"
+crane manifest "${SHELLCHECK_REPO}:${SHELLCHECK_VERSION}" > tmp/manifests.json
+
+# Extract the actual
+DIGEST_VERSION=$(jq -r '[ .manifests[] | select ( .platform.os == "darwin" and .platform.architecture == "arm64" ) ] | reverse | .[0].digest' < tmp/manifests.json)
+
+echo "Downloading shellcheck image from ${SHELLCHECK_REPO}@${DIGEST_VERSION}..."
+crane pull "${SHELLCHECK_REPO}@${DIGEST_VERSION}" tmp/shellcheck-image.tar
+
+pushd tmp || exit 1
+echo "Extracting shellcheck image..."
+rm -rf layers && mkdir layers
+tar xvzf shellcheck-image.tar -C layers
+
+LAYER=$(jq -r '.[0].Layers[0]' < layers/manifest.json)
+popd
+
+mkdir -p dist/
+cp "tmp/layers/${LAYER}" "dist/shellcheck-${SHELLCHECK_VERSION}.tar.gz"
+
+echo "dist/shellcheck-${SHELLCHECK_VERSION}.tar.gz"
+
+# At last, upload the artifact :)