fetch env variable

Signed-off-by: Mark Slowey <mark.slowey1@nhs.net>

Author: Namitha-Prabhu

.github/actions/acceptance-tests/action.yaml

@@ -33,9 +33,12 @@ runs:
       run: |
         npm ci
 
+    - name: "Set PR NUMBER"
+      shell: bash
+      run: |
+          echo "PR_NUMBER=${{ inputs.pr_number }}" >> $GITHUB_ENV
+
     - name: Run test - ${{ inputs.testType }}
-      env:
-          PR_NUMBER: ${{ inputs.pr_number }}
       shell: bash
       run: |
         make test-${{ inputs.testType }}