use the example env to use a consistent encryption key

.github/workflows/container-publish.yml

@@ -67,6 +67,9 @@ jobs:
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
 
+      - name: Use example .env for the encryption env
+        run: cp .env.example .env        
+
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
@@ -94,4 +97,4 @@ jobs:
           DIGEST: ${{ steps.build-and-push.outputs.digest }}
         # This step uses the identity token to provision an ephemeral certificate
         # against the sigstore community Fulcio instance.
-        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
+        run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}