documentation: dgoss on mac needs DGOSS_TEMP_DIR (#873)

Co-authored-by: Ahmed Elsabbahy <[email protected]>

extras/dgoss/README.md

@@ -29,6 +29,9 @@ curl -L https://github.com/goss-org/goss/releases/download/v0.3.6/goss-linux-amd
 # Set your GOSS_PATH to the above location
 export GOSS_PATH=~/Downloads/goss-linux-amd64
 
+# Set DGOSS_TEMP_DIR to the tmp directory in your home, since /tmp is private on Mac OSX
+export DGOSS_TEMP_DIR=~/tmp
+
 # Use dgoss
 dgoss edit ...
 dgoss run ...
@@ -131,4 +134,4 @@ Location of the temporary directory used by dgoss. (Default `'$(mktemp -d /tmp/t
 
 #### CONTAINER_RUNTIME
 
-Container runtime to use - `docker` or `podman`. Defaults to `docker`. Note that `podman` requires a run command to keep the container running. This defaults to `sleep infinity` in case only an image is passed to `dgoss` commands.
+Container runtime to use - `docker` or `podman`. Defaults to `docker`. Note that `podman` requires a run command to keep the container running. This defaults to `sleep infinity` in case only an image is passed to `dgoss` commands.