Automatically get DB name

Author: gfrn

.github/workflows/_integration.yml

@@ -6,12 +6,25 @@ on:
       CODECOV_TOKEN:
         required: true
 
+
+
 jobs:
+  get-db-image:
+    runs-on: ubuntu-latest
+    env:
+      BRANCH_NAME: ${{ github.ref_type == 'tag' && 'master' || (github.head_ref || github.ref_name) }}
+    outputs:
+      branch: ${{ steps.clean.outputs.branch }}
+    steps:
+      - id: clean
+        name: "Clean branch name"
+        run: echo "branch=${BRANCH_NAME//\//-}" >> "$GITHUB_OUTPUT"
   test:
     runs-on: ubuntu-latest
+    needs: get-db-image
     services:
       integration-db:
-        image: ghcr.io/diamondlightsource/pato-backend-db:${{ github.ref_type == 'tag' && 'master' || (github.head_ref || github.ref_name) }}
+        image: ghcr.io/diamondlightsource/pato-backend-db:${{ needs.get-db-image.outputs.branch }}
         ports:
           - 3306:3306
     strategy: