split harness into more stages

.harness/firebase-deploy.yaml

@@ -2,13 +2,9 @@ version: 1
 kind: pipeline
 spec:
   stages:
-  - name: build
+  - name: debug
     type: ci
     spec:
-      volumes:
-      - name: dockersock
-        spec: {}
-        type: temp
       steps:
       - name: debug
         type: run
@@ -23,6 +19,14 @@ spec:
             export build_after=${{ build.after }}
             env | grep ^build_
             git --no-pager diff --name-only $build_before..$build_after
+  - name: dockers
+    type: ci
+    spec:
+      volumes:
+      - name: dockersock
+        spec: {}
+        type: temp
+      steps:
       - name: dind
         when: build.event == "push" && build.target == "main"
         type: background
@@ -58,6 +62,10 @@ spec:
               docker build -t "$t" -f ./Dockerfile.cicd .
               docker push "$t"
             fi
+  - name: build
+    type: ci
+    spec:
+      steps:
       - name: build
         type: run
         when: build.event == "push" && build.target == "main"