Set ov workdir to current working directory (#4527)

* Set `ov` workdir to current working directory

This makes `ov` contextual to the working directory, so you can rely on your host CWD inside `ov`. This works because the Openverse repository is mapped with the literal directory path from your host (rather than to a distinct container path), so the CWD will exist in the container, so long as `ov` is run from within the repository

* Use `pwd` and use absolute reference for exec.py

docker/dev_env/run.sh

@@ -13,7 +13,7 @@ shared_args=(
   -i
   --env "OPENVERSE_PROJECT=$OPENVERSE_PROJECT"
   --env "TERM=xterm-256color"
-  --workdir "$OPENVERSE_PROJECT"
+  --workdir "$(pwd)"
 )
 
 run_args=(
@@ -104,4 +104,4 @@ else
   docker start "$existing_container_id" 1>/dev/null
 fi
 
-docker exec "${shared_args[@]}" "$container_name" python3 docker/dev_env/exec.py "${_cmd[@]}"
+docker exec "${shared_args[@]}" "$container_name" python3 "$OPENVERSE_PROJECT"/docker/dev_env/exec.py "${_cmd[@]}"