Fix upload url issue (#334)

* Pass the upload url from the calling workflow to the reusable workflow.

Author: MartinWheelerMT

.github/workflows/release.yml

@@ -6,11 +6,15 @@ jobs:
   push_to_dockerhub:
     strategy:
       matrix:
-        image:
-          - {folder: ., dockerhub_name: nia-nhais-adaptor}
+        config:
+          - folder: .
+            dockerhub_name: nia-nhais-adaptor
+            upload_url: ${{ github.event.release.upload_url }}
+
     uses: NHSDigital/integration-adaptor-actions/.github/workflows/release-adaptor-container-image.yml@main
     with:
-        dockerhub_name: ${{matrix.image.dockerhub_name}}
-        folder: ${{matrix.image.folder}}
+        dockerhub_name: ${{matrix.config.dockerhub_name}}
+        folder: ${{matrix.config.folder}}
+        upload_url: ${{matrix.config.upload_url}}
 
-    secrets: inherit
+    secrets: inherit