diff --git a/.github/workflows/ci_test_docker.yml b/.github/workflows/ci_test_docker.yml
index 51991a10d..cc409d388 100644
--- a/.github/workflows/ci_test_docker.yml
+++ b/.github/workflows/ci_test_docker.yml
@@ -4,6 +4,7 @@ on: [pull_request,workflow_dispatch]
 
 env:
   TEST_TAG: dtcenter/ccpp-scm:test
+  PR_NUMBER: ${{ github.event.number }}
 
 jobs:
   docker:
@@ -22,6 +23,7 @@ jobs:
           file: docker/Dockerfile
           load: true
           tags: ${{ env.TEST_TAG }}
+          PR_NUMBER: ${PR_NUMBER}
       - name: Test
         run: |
           mkdir $HOME/output
diff --git a/docker/Dockerfile b/docker/Dockerfile
index aa0f33e07..8b0655b86 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -17,6 +17,8 @@ RUN ln -s /usr/bin/python3 /usr/bin/python
 # f90nml can't be installed for debian that way
 RUN pip install f90nml --break-system-packages
 
+RUN echo "PR_NUMBER IS ${PR_NUMBER}"
+
 #Compiler environment variables
 ENV CC=/usr/bin/gcc
 ENV FC=/usr/bin/gfortran