hack/dc don't docker-compose up everything

Signed-off-by: Bohan Chen <bochen@pivotal.io>

hack/dc

@@ -5,9 +5,10 @@ set -e -u
 cd $(dirname $0)/..
 
 args=(-f docker-compose.yml)
+core=(vault prometheus jaeger)
 
-for f in hack/overrides/*.yml; do
-  args+=(-f $f)
+for f in "${core[@]}"; do
+  args+=(-f "hack/overrides/$f.yml")
 done
 
 docker-compose ${args[@]} "$@"

hack/overrides/oidc.yml

@@ -1,5 +1,9 @@
 # oidc.yml - a docker-compose override that adds a OIDC auth to the stack
 #
+# Note: due to docker networking, when logging into Concourse, it'll redirect
+# you to `http://oidc:9000/auth?client_id=...`. Just change the hostname to be
+# `http://localhost:9000/auth?client_id=...` and it'll work just fine.
+#
 # There are 2 users and 1 group:
 # user1@example.com:user1pass;group1
 # user2@example.com:user2pass