mount PACTA_DATA_PATH as sub-directory of /pacta-data/ (#72)

* add an outputs directory

* add config name to outputs sub-directory name

* mount `PACTA_DATA_PATH` as sub-directory of `/pacta-data/`

* Update README.md

* Update README.md

* Update docker-compose.yml

* Update prepare_pacta_indices.R

* Update prepare_pacta_indices.R

README.md

@@ -25,12 +25,14 @@ The simplest way to run the data preparation process is by using docker.
 First, create a `.env` file in the root directory with the following fields: 
 
 ``` env
-PACTA_DATA_PATH=PATH/TO/pacta-data
+PACTA_DATA_PATH=PATH/TO/PACTA/DATA/DIR
 R_CONFIG_ACTIVE=YYYYQQ
 ```
 The `R_CONFIG_ACTIVE` variable should point to the appropriate set of 
 configuration values specified in the `config.yml` file. 
 
+The `PACTA_DATA_PATH` variable should point to an appropriate directory with read access on the host system that contains a version of the PACTA analysis inputs for the desired quarter.
+
 Once these variables have been set, simply run 
 
 ``` bash

docker-compose.yml

@@ -6,4 +6,4 @@ services:
     env_file:
       - .env
     volumes:
-      - ${PACTA_DATA_PATH}:/pacta-data
+      - ${PACTA_DATA_PATH}:/pacta-data/${R_CONFIG_ACTIVE}