FreeBSD builds of Azure Pipelines Agent

• FreeBSD 13.2, 14.0
• pkg install bash curl git icu libinotify libunwind node
• Willingness to run unsupported app built from unsupported SDK

• installdependencies.sh has no idea what to do
• No auto update feature
• DownloadPipelineArtifact@ fails due to unknown OS: microsoft/azure-pipelines-agent#3266 (comment) and #1