ci: Agent build is broken on PR checks

[jcvenegas]

CI fail with:

Script finished
curl: (22) The requested URL returned error: 404 Not Found
13:25:32 main [ERRO] asked to process document index 0 but there are only 0 document(s)
ERROR: Could not detect the required Go version for AGENT_VERSION='f4f14e5'.
Failed at 116: sudo -E AGENT_INIT="${AGENT_INIT}" AGENT_VERSION="${agent_commit}" GOPATH="$GOPATH" USE_DOCKER=true OS_VERSION=${os_version} ./rootfs-builder/rootfs.sh "${distro}"
Failed at 18: "${cidir}/install_kata_image.sh"
Build step 'Execute shell' marked build as failure
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