Fix yaml file. (#94)

diff --git a/container/debian8/builders/rbe-debian8/rbe-debian8.yaml b/container/debian8/builders/rbe-debian8/rbe-debian8.yaml
index e499def..e222900 100644
--- a/container/debian8/builders/rbe-debian8/rbe-debian8.yaml
+++ b/container/debian8/builders/rbe-debian8/rbe-debian8.yaml
@@ -20,5 +20,5 @@
 
 metadataTest:
   env:
-    -key: 'PATH'
-     value: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/python3.6/bin:/usr/local/go/bin'
+    - key: 'PATH'
+      value: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/python3.6/bin:/usr/local/go/bin'
diff --git a/container/experimental/rbe-debian9/rbe-debian9.yaml b/container/experimental/rbe-debian9/rbe-debian9.yaml
index ed06f7d..20ce8cc 100644
--- a/container/experimental/rbe-debian9/rbe-debian9.yaml
+++ b/container/experimental/rbe-debian9/rbe-debian9.yaml
@@ -20,5 +20,5 @@
 
 metadataTest:
   env:
-    -key: 'PATH'
-     value: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/go/bin'
+    - key: 'PATH'
+      value: '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/go/bin'