adding the variable for the image

Author: mike dupont

.github/workflows/run-docker-tests.yml

@@ -1,5 +1,6 @@
 name: run Perf Test and collect data
-
+env:
+  DOCKER_IMAGE_URL: "ghcr.io/meta-introspector/o1js/o1js-perf-recording:sha256:5ce0221662cecbca9a3de05601af94a15b154a3bcf8bafcb0cfa1f5b9f407bdc"
 on:
   workflow_dispatch:
   push:
@@ -11,8 +12,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: meta-introspector/checkout@v4
-      with: 
-        submodules: recursive
+      #with: 
+      #  submodules: recursive
 
     - name: Login to GHCR
       uses: meta-introspector/login-action@v1
@@ -22,10 +23,12 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
 
     - name: pull the image
-      run: docker pull ghcr.io/meta-introspector/o1js/o1js-perf-recording:latest
+      run: docker pull ${DOCKER_IMAGE_URL}
 
     - name: run the Docker tests
       run: docker compose up mina-local-network
+      env:
+        DOCKER_IMAGE_URL: ${DOCKER_IMAGE_URL}       
 
     - name: docker cp results
       run: docker compose cp mina-local-network:/tmp/perf.data.tar.gz perf.data.tar.gz