diff --git a/.github/workflows/flux-local-diff.yaml b/.github/workflows/flux-local-diff.yaml
index 0556627e..94bde468 100644
--- a/.github/workflows/flux-local-diff.yaml
+++ b/.github/workflows/flux-local-diff.yaml
@@ -29,6 +29,7 @@ jobs:
         path: ${{ matrix.cluster_path }}
         resource: ${{ matrix.resource }}
         debug: true
+        sources: cluster=tests/testdata/cluster3
     - name: PR Comments
       uses: mshick/add-pr-comment@v2
       if: ${{ steps.diff.outputs.diff != '' }}
diff --git a/.github/workflows/flux-local-test.yaml b/.github/workflows/flux-local-test.yaml
index e0beddae..848039ea 100644
--- a/.github/workflows/flux-local-test.yaml
+++ b/.github/workflows/flux-local-test.yaml
@@ -18,3 +18,4 @@ jobs:
       with:
         enable-helm: true
         enable-kyverno: false
+        sources: cluster=tests/testdata/cluster3
diff --git a/action/diff/action.yml b/action/diff/action.yml
index 23c4404e..5151ef54 100644
--- a/action/diff/action.yml
+++ b/action/diff/action.yml
@@ -36,6 +36,9 @@ inputs:
   kustomize-build-flags:
     description: Additional flags to pass to kustomize build
     default: ''
+  sources:
+    description: OCIRepository source mappings like `cluster=./kubernetes/`
+    default: ''
 outputs:
   diff:
     description: Output of the diff command or empty if there is no diff
@@ -79,6 +82,7 @@ runs:
             --limit-bytes ${{ inputs.limit-bytes }} \
             --all-namespaces \
             --kustomize-build-flags="${{ inputs.kustomize-build-flags }}" \
+            --sources "${{ inputs.sources }}" \
             >> $GITHUB_OUTPUT
         echo "${delimiter}" >> $GITHUB_OUTPUT
       shell: bash
diff --git a/action/test/action.yml b/action/test/action.yml
index 50212d9d..03979492 100644
--- a/action/test/action.yml
+++ b/action/test/action.yml
@@ -29,6 +29,9 @@ inputs:
   kustomize-build-flags:
     description: Additional flags to pass to kustomize build
     default: ''
+  sources:
+    description: OCIRepository source mappings like `cluster=./kubernetes/`
+    default: ''
 runs:
   using: "composite"
   steps:
@@ -56,5 +59,6 @@ runs:
           --${{ inputs.enable-kyverno != 'true' && 'no-' || '' }}enable-kyverno \
           --api-versions "${{ inputs.api-versions }}" \
           --kustomize-build-flags="${{ inputs.kustomize-build-flags }}" \
+          --sources "${{ inputs.sources }}" \
           --path ${{ inputs.path }}
       shell: bash