For external users of the pipeline construction, the token might be in
a different path than `/run/agenix/buildkite-graphql-token`.
It is made configurable through the BUILDKITE_TOKEN_PATH environment
variable. This should be configured on the pipeline level to apply to
all steps.
Change-Id: I23c52e2d705e4134b8b013f8603f92e5533a6e44
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5424
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: asmundo <asmundo@gmail.com>