use variable findings to set build_before/after to varaible for checking if should docker build

.harness/firebase-deploy.yaml

@@ -45,9 +45,13 @@ spec:
           shell: sh
           script: |
             set -ueo pipefail
+
+            export build_before=${{ build.before }}
+            export build_after=${{ build.after }}
+
             apk add --no-cache git
             t=registry-app.inhome.blapointe.com:5001/portfolio/resume/builder:latest
-            if git diff --name-only ${{ build.before }} ${{ build.after }} | grep Dockerfile.cicd; then
+            if git diff --name-only $build_before..$build_after | grep Dockerfile.cicd; then
               until docker ps; do
                 sleep 5
               done