remove redundant tool versions files.

Author: RossBugginsNHS

src/.tool-versions

@@ -16,7 +16,7 @@ RUN test -n ${CONTAINER_NAME}
 RUN test -n ${BASE_IMAGE_TAG}
 RUN test -n ${BASE_CONTAINER_PREFIX}
 
-ENV BASE_IMAGE_TAG=${BASE_IMAGE_TAG}
+ENV DEFAULT_IMAGE_TAG=${BASE_IMAGE_TAG}
 
 COPY scripts ${SCRIPTS_DIR}/${CONTAINER_NAME}
 WORKDIR ${SCRIPTS_DIR}/${CONTAINER_NAME}

src/devcontainers/base/.tool-versions

@@ -16,7 +16,7 @@ RUN test -n ${CONTAINER_NAME}
 RUN test -n ${BASE_IMAGE_TAG}
 RUN test -n ${BASE_CONTAINER_PREFIX}
 
-ENV BASE_IMAGE_TAG=${BASE_IMAGE_TAG}
+ENV LOADED_IMAGE_TAG=${BASE_IMAGE_TAG}
 
 COPY scripts ${SCRIPTS_DIR}/${CONTAINER_NAME}
 WORKDIR ${SCRIPTS_DIR}/${CONTAINER_NAME}