Add cloudsmith support

[gastmaier]

Below are some useful use cases, including fetching the latest package that match a set of labels.
However, with the git hash as version for raw packages, the download url is predictable and this matching logic can be skipped.

[gastmaier]

org_repository=adi/linux
cloudsmith_token=

# Mock modifiers
mock_arch=gcc_arm
mock_defconfig=adi_bcm2712_defconfig
mock_event=on/pull_request
mock_branch=branch/staging/bcm2712

mock_tags="refs/heads/main, on/push"

cs_package_upload () {
  package=adi-linux.tar
  package_=adi-linux.tar

  raw=$(curl -L \
    -T $package \
    -H "X-Api-Key: $cloudsmith_token" \
    -H "Content-Sha256: $(shasum -a256 $package | cut -f1 -d' ')" \
    https://upload.cloudsmith.io/$org_repository/$package_)
  echo $raw 1>&2
  echo $(echo $raw | jq -r .identifier)
}

cs_package_store () {
  # mock sha
  version=$(echo -n $(tr -dc A-Za-z0-9 </dev/urandom | head -c 12; echo) | openssl sha256 | cut -c 18-30)

  curl -L \
    -X POST \
    -H "Accept: application/json" \
    -H "Content-Type: application/json" \
    -H "X-Api-Key: $cloudsmith_token" \
    -d "{\"package_file\":\"$2\", \
         \"republish\":\"true\", \
         \"name\":\"$1\", \
         \"tags\": \"$3\",\
         \"version\":\"$version\"}" \
    https://api.cloudsmith.com/v1/packages/$org_repository/upload/raw/
}

cs_package () {
  name=adi-linux.tar
  package_file=$(cs_package_upload)
  tags=$mock_tags

  if [[ ! "$package_file" == "null" ]]; then
    cs_package_store "$name" "$package_file" "$tags"
  fi
}


cs_get_latest () {
  sort="-date"
  page_size="1"

  raw=$(curl -L \
    -H "X-Api-Key: $cloudsmith_token" \
    "https://api.cloudsmith.io/v1/packages/$org_repository/?query=$1&sort=$sort&page_size=$page_size")
  echo $raw 1>&2
  echo $(echo $raw | jq -r '.[0] | .cdn_url')
}

cs_package_download () {
  curl -L \
    -H "X-Api-Key: $cloudsmith_token" \
    -O $1
}

cs_download() {
  query="repository:^ssg-linux$+tag:^$mock_branch$+name:^linux/$mock_arch/$mock_defconfig+tag:^$mock_event$"

  cdn_url=$(cs_get_latest $query)
  if [[ ! "$cdn_url" == "null" ]]; then
    cs_package_download $cdn_url
  fi