Minor fixups.

.ci/fly-set-pipeline

@@ -0,0 +1,2 @@
+#!/bin/sh
+exec fly -t bm set-pipeline -c .concourse.yml -p blastmud-build

.concourse.yml

@@ -12,14 +12,13 @@ jobs:
           source:
             repository: rust
         inputs:
-          - blastmud-repo
+          - name: blastmud-repo
         caches:
-          - target
+          - path: target
         outputs:
-          - target
+          - name: target
         run:
           path: blastmud-repo/.ci/build
-          args: ["Hello", "world!"]
 resources:
   - name: blastmud-repo
     type: git