ci: add missing build script

buildx.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+IMAGE_NAME="willfarrell/autoheal"
+
+usage() {
+  echo "Usage: $0"
+}
+
+array_join() {
+  local IFS="$1"
+  shift
+  echo "$*"
+}
+
+get_available_architectures() {
+  local image="$1"
+  local tag="${2:-latest}"
+
+  docker buildx imagetools inspect --raw "${image}:${tag}" | \
+    jq -r '.manifests[].platform | .os + "/" + .architecture + "/" + .variant' | \
+    sed 's#/$##' | sort
+}
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]
+then
+  set -ex
+
+  cd "$(readlink -f "$(dirname "$0")")" || exit 9
+
+  read -r base_image base_tag <<< \
+    "$(sed -nr 's/^FROM\s+([^:]+):?((\w+).*)\s*$/\1 \3/p' Dockerfile | head -1)"
+  # shellcheck disable=2207
+  platforms=($(get_available_architectures "$base_image" "$base_tag"))
+
+  PUSH_IMAGE=true
+  BUILD_TYPE=manual
+
+  if [[ "$TRAVIS" == "true" ]]
+  then
+    BUILD_TYPE=travis
+  elif [[ "$GITHUB_ACTIONS" == "true" ]]
+  then
+    BUILD_TYPE=github
+  fi
+
+  docker buildx build \
+    --platform "$(array_join "," "${platforms[@]}")" \
+    --output "type=image,push=${PUSH_IMAGE}" \
+    --no-cache \
+    --label=build-type="$BUILD_TYPE" \
+    --label=built-on="$HOSTNAME" \
+    --tag "${IMAGE_NAME}:latest" \
+    .
+fi