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## Problem
Jobs that call a reusable workflow (`uses:`) whose steps contain a `run:
|` block that **starts with blank lines** never start — the child jobs
stay `Blocked` forever, the run never finishes, and nothing is shown to
the user (the error is only logged at DEBUG). The reusable is valid YAML
and worked on 1.26.
## Root cause
`jobparser` serializes each expanded job via `SingleWorkflow.SetJob()`,
which uses `yaml.NewEncoder(...).SetIndent(2)`, but
`SingleWorkflow.Marshal()` used `yaml.Marshal`, whose default
indentation is **4**. Re-emitting a multi-line literal block scalar at a
different indentation makes the encoder write a wrong explicit
indentation indicator (`run: |4`) whose declared indent doesn't match
the actual content indent. The stored `workflow_payload` is then
unparseable:
```
run: |4
while ...
```
`jobparser.Parse` / `model.ReadWorkflow` (both go.yaml.in/yaml/v4)
reject it: `did not find expected key`. This surfaces in
`services/actions/job_emitter.go` `resolve()` →
`updateConcurrencyEvaluationForJobWithNeeds` → `ParseJob`, where the
error is swallowed at `log.Debug` and the job is left `Blocked`.
Encoding at indent 4 triggers the bad indicator; indent 2 does not —
matching the value already used by `SetJob`.
## Fix
Encode `SingleWorkflow.Marshal()` with `SetIndent(2)` so both encoders
agree and the serialized single workflow round-trips. Adds a regression
test (`Parse → Marshal → Parse` on a `run:` block with leading blank
lines) that fails before the change with `did not find expected key`.
---------
Signed-off-by: quasimodo <mohamed.belkamel@intelcia.com>
Co-authored-by: quasimodo <mohamed.belkamel@intelcia.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>