fix: kaniko taking snapshot every stage

.gitlab-ci.yml

@@ -9,7 +9,7 @@ build:
     entrypoint: [""]
   script:
     - echo "{\"auths\":{\"harbor.c3sl.ufpr.br\":{\"username\":\"$HARBOR_USER\",\"password\":\"$HARBOR_PASSWORD\"}}}" > /kaniko/.docker/config.json
-    - /kaniko/executor --context . --destination harbor.c3sl.ufpr.br/root/docs --cache=true --dockerfile "${CI_PROJECT_DIR}/Dockerfile"
+    - /kaniko/executor --single-snapshot --context . --destination harbor.c3sl.ufpr.br/root/docs --cache=true --dockerfile "${CI_PROJECT_DIR}/Dockerfile"
 
 deploy:
   stage: deploy