add deployment tag path and reademes

helm/diff/action.yml

@@ -22,6 +22,9 @@ inputs:
   CHART_PATH:
     description: "Path to the Helm chart"
     default: "./helm"
+  TAG_KEY:
+    description: "Helm --set key for the image tag (e.g. deploy.api.tag)"
+    required: true
 
 runs:
   using: composite
@@ -33,6 +36,6 @@ runs:
     - name: Helm Diff
       shell: sh
       run: |
-        CMD="helm diff upgrade ${{ inputs.DEPLOYMENT_NAME }} ${{ inputs.CHART_PATH }} -n ${{ inputs.DEPLOYMENT_NAMESPACE }} --values ${{ inputs.VALUES_FILE }} --set deploy.${{ inputs.CONTAINER_NAME }}.tag=${{ inputs.IMAGE_TAG }} --set image.repository=${{ inputs.IMAGE_PATH }} --context 5"
+        CMD="helm diff upgrade ${{ inputs.DEPLOYMENT_NAME }} ${{ inputs.CHART_PATH }} -n ${{ inputs.DEPLOYMENT_NAMESPACE }} --values ${{ inputs.VALUES_FILE }} --set ${TAG_KEY}=${{ inputs.IMAGE_TAG }} --set image.repository=${{ inputs.IMAGE_PATH }} --context 5"
         echo "Running: $CMD"
         eval "$CMD"