Patched options() to let container options propagate to job containers (#80)

This PR let "general" container config to be propagated to each job container.

See:
- https://gitea.com/gitea/act_runner/issues/265#issuecomment-744382
- https://gitea.com/gitea/act_runner/issues/79
- https://gitea.com/gitea/act_runner/issues/378

Reviewed-on: https://gitea.com/gitea/act/pulls/80
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: Claudio Nicora <claudio.nicora@gmail.com>
Co-committed-by: Claudio Nicora <claudio.nicora@gmail.com>

pkg/runner/run_context.go

@@ -649,7 +649,7 @@ func (rc *RunContext) options(ctx context.Context) string {
 	job := rc.Run.Job()
 	c := job.Container()
 	if c != nil {
-		return rc.ExprEval.Interpolate(ctx, c.Options)
+		return rc.Config.ContainerOptions + " " + rc.ExprEval.Interpolate(ctx, c.Options)
 	}
 
 	return rc.Config.ContainerOptions