Make a feature for Drone runner to execute single pipeline only (and shutdown)

[theanurin]

Make a feature for Drone runner to execute single pipeline only (and shutdown)

Notes

Connect runner to Drone CI server

Follow installation guide https://docs.drone.io/runner/exec/overview/ to obtain binaries or build yourself from sources.
!!!DO NOT INSTALL AS SERVICE!!!

DRONE_RPC_SECRET=...
LABEL_ROLE=...

cat <<EOF > "drone-runner-${LABEL_ROLE}.env"
DRONE_RPC_PROTO="https"
DRONE_RPC_HOST="drone.infra.zxteam.net"
DRONE_RPC_SECRET="${DRONE_RPC_SECRET}"
DRONE_RUNNER_CAPACITY="1"
DRONE_HTTP_BIND="-1"
DRONE_UI_DISABLE="true"
DRONE_RUNNER_LABELS="role:${LABEL_ROLE}"
EOF

./drone-runner-exec daemon "drone-runner-${LABEL_ROLE}.env"

[theanurin]

Similar feature woodpecker-ci/woodpecker#4019

[theanurin]

Looks like main loop of runner here https://github.com/theanurin/gitness/blob/drone-1-single-pipeline/operator/runner/runner.go#L540-L551