build: Added environment varible for credentials file path

Author: mediumTaj

.secrets.baseline

@@ -1,6 +1,6 @@
 {
   "exclude_regex": null,
-  "generated_at": "2019-01-16T21:58:27Z",
+  "generated_at": "2019-01-31T23:42:02Z",
   "plugins_used": [
     {
       "base64_limit": 4.5,
@@ -55,13 +55,13 @@
       {
         "hashed_secret": "c51238bc51c3b0abee7f61d90c414aec89009734",
         "is_secret": false,
-        "line_number": 48,
+        "line_number": 49,
         "type": "Basic Auth Credentials"
       },
       {
         "hashed_secret": "3f820839b94508b2a9dc3b3e6e1149080af8780c",
         "is_secret": false,
-        "line_number": 83,
+        "line_number": 84,
         "type": "Basic Auth Credentials"
       }
     ]

appveyor.yml

@@ -17,6 +17,7 @@ environment:
     secure: gevsMhy8RTWMdf7MjOnIo5QaN6JpL9DPK6I+Go5ByZir5LDwyFsv9hO6nBjGTg8n
   GITHUB_TOKEN:
     secure: +B2bs86RVtJtlbkB+cTf9bkqnNlFJi/PbBBPzR5jlUlLLZoOc+ZgqgQLwee4tCT+
+  IBM_CREDENTIALS_FILE: C:\projects\sdk-credentials\ibm-credentials.env
 install:
 # Get the latest stable version of Node.js or io.js
 - ps: Install-Product node $env:nodejs_version