option to set global shm_size

command/daemon/config.go

@@ -76,6 +76,7 @@ type Config struct {
 		CPUPeriod  int64    `envconfig:"DRONE_CPU_PERIOD"`
 		CPUShares  int64    `envconfig:"DRONE_CPU_SHARES"`
 		CPUSet     []string `envconfig:"DRONE_CPU_SET"`
+		ShmSize    int64    `envconfig:"DRONE_SHM_SIZE"`
 	}
 
 	Environ struct {

command/daemon/daemon.go

@@ -131,6 +131,7 @@ func (c *daemonCommand) run(*kingpin.ParseContext) error {
 				CPUPeriod:  config.Resources.CPUPeriod,
 				CPUShares:  config.Resources.CPUShares,
 				CPUSet:     config.Resources.CPUSet,
+				ShmSize:    config.Resources.ShmSize,
 			},
 			Environ: provider.Combine(
 				provider.Static(config.Runner.Environ),