Fix docker cfg cache dir

Author: viniciusam

.travis.yml

@@ -9,7 +9,7 @@ jdk:
 
 env:
   global:
-    - DOCKER_CFG=$HOME/.docker/config.json
+    - DOCKER_CFG=$HOME/.docker
     - DOCKER_REPO="viniciusam/oracledb"
     - UTPLSQL_VERSION="v3.0.0-beta"
     - UTPLSQL_FILE="utPLSQLv3.0.0.562-beta"

.travis/start_db.sh

@@ -2,7 +2,7 @@
 set -e
 
 # If docker credentials are not cached, do the login.
-if [ ! -f $DOCKER_CFG ]; then
+if [ ! -f $DOCKER_CFG/config.json ]; then
     docker login -u "$DOCKER_USER" -p "$DOCKER_PASSWORD"
 else
     echo "Using docker login from cache..."