fix: revert previous commit and pass LARVATAGGER_IMAGE_TAG build arg

.gitlab-ci.yml

 variables:
   GITLAB_PASTEUR_PROJECT_ID: 6531
   PROJECT_NAME: nyxui
-  LARVATAGGER_IMAGE_TAG: 0.20.1-bigfat
 
 stages:
   - build
@@ -101,7 +100,6 @@ deploy to dev.pasteur.cloud:
     LT_LIMITS_CPU: "2"
     LT_LIMITS_MEMORY: "5Gi"
     LT_LIMITS_STORAGE: "2Gi"
-    LT_IMAGE_TAG: "$LARVATAGGER_IMAGE_TAG"
   environment:
     name: k8sdev-01/nyx-dev
     url: https://nyx.dev.pasteur.cloud
@@ -114,8 +112,8 @@ build larvatagger backend:
   extends: .build-with-buildah
   variables:
     IMAGE_NAME: "larvatagger"
-    IMAGE_TAG: "$LARVATAGGER_IMAGE_TAG"
-    BUILD_CONTEXT: "back"
+    IMAGE_TAG: "0.20.1-bigfat"
+    BUILD_CONTEXT: "--build-arg LARVATAGGER_IMAGE_TAG=$IMAGE_TAG back"
     CONTAINERFILE: "back/Containerfile.larvatagger"
   rules:
     - if: ($CI_COMMIT_BRANCH == "dev" &&

back/Containerfile.larvatagger

-ARG LARVATAGGER_IMAGE_TAG=0.20-bigfat
+ARG LARVATAGGER_IMAGE_TAG=0.20.1-bigfat
 FROM docker.io/flaur/larvatagger:${LARVATAGGER_IMAGE_TAG} as src