Added dev run command

Author: JeroenBoersma

bin/dev_command/run

@@ -0,0 +1,12 @@
+
+
+dc mode run;
+dc service $1;
+
+if [ -n "${DEV_PROJECTDIR}" ]; then
+    dc opt "-w /data/${DEV_PROJECTDIR}"
+fi
+
+shift;
+dc cmd "$*";
+

docs/development-commands.md

@@ -28,6 +28,8 @@ To control your docker environment.
   alias for `dev update && dev build && dev down && dev up`
 - `restart [CONTAINER]`
   restart all or a specific container
+- `run`
+  run one-off commands in new container
 - `setup`
   Run setup for defaults
 - `start`