Move credentials file elsewher

Less risk of it being accidentally committed or wiped out by git clean.

concourse/pipeline.yml

@@ -3,7 +3,7 @@ resources:
   type: git
   source:
     uri: git@github.com:spring-projects/sts4.git
-    branch: concourse
+    branch: master
     username: kdvolder
     private_key: {{rsa_id}}
     paths:
@@ -12,7 +12,7 @@ resources:
   type: git
   source:
     uri: git@github.com:spring-projects/sts4.git
-    branch: concourse
+    branch: master
     private_key: {{rsa_id}}
 - name: docker-image
   type: docker-image

concourse/set-pipeline.sh

@@ -1,2 +1,2 @@
 #!/bin/bash
-fly -t tools set-pipeline --load-vars-from credentials.yml -p sts4 -c pipeline.yml
+fly -t tools set-pipeline --load-vars-from ${HOME}/.sts4-concourse-credentials.yml -p sts4 -c pipeline.yml