Use build matrix for node pipeline

Author: twometresteve

.buildkite/node-pipeline.yml

@@ -19,62 +19,19 @@ steps:
               push:
                 - node-maze-runner:855461928731.dkr.ecr.us-west-1.amazonaws.com/js:ci-node-${BRANCH_NAME}
 
-      - label: ":node: Node 4"
+      - label: ":node: Node {{matrix}}"
         depends_on: "node-maze-runner-image"
         timeout_in_minutes: 30
+        matrix:
+          - 4
+          - 6
+          - 8
+          - 10
+          - 12
+          - 14
         plugins:
           docker-compose#v3.9.0:
             run: node-maze-runner
             use-aliases: true
         env:
-          NODE_VERSION: "4"
-
-      - label: ":node: Node 6"
-        depends_on: "node-maze-runner-image"
-        timeout_in_minutes: 30
-        plugins:
-          docker-compose#v3.9.0:
-            run: node-maze-runner
-            use-aliases: true
-        env:
-          NODE_VERSION: "6"
-
-      - label: ":node: Node 8"
-        depends_on: "node-maze-runner-image"
-        timeout_in_minutes: 30
-        plugins:
-          docker-compose#v3.9.0:
-            run: node-maze-runner
-            use-aliases: true
-        env:
-          NODE_VERSION: "8"
-
-      - label: ":node: Node 10"
-        depends_on: "node-maze-runner-image"
-        timeout_in_minutes: 30
-        plugins:
-          docker-compose#v3.9.0:
-            run: node-maze-runner
-            use-aliases: true
-        env:
-          NODE_VERSION: "10"
-
-      - label: ":node: Node 12"
-        depends_on: "node-maze-runner-image"
-        timeout_in_minutes: 30
-        plugins:
-          docker-compose#v3.9.0:
-            run: node-maze-runner
-            use-aliases: true
-        env:
-          NODE_VERSION: "12"
-
-      - label: ":node: Node 14"
-        depends_on: "node-maze-runner-image"
-        timeout_in_minutes: 30
-        plugins:
-          docker-compose#v3.9.0:
-            run: node-maze-runner
-            use-aliases: true
-        env:
-          NODE_VERSION: "14"
+          NODE_VERSION: "{{matrix}}"