forward ssh-agent into the container for the docker-compose file

Author: robbyoconnor

docker-compose.yml

@@ -8,4 +8,7 @@ services:
       - ~/aosp:/aosp
       - ~/.gitconfig:/home/aosp/.gitconfig
       # uncomment if you want this
-      #- ~/.ssh/:/home/.ssh/
+      - ~/.ssh:/home/aosp/.ssh
+      - $SSH_AUTH_SOCK:/tmp/ssh_auth
+    environment:
+      - SSH_AUTH_SOCK=/tmp/ssh_auth