Update Dockerfile

Dockerfile

 ARG DOCKER_REGISTRY=registry.cyberbrain.pw
 
 FROM anchore/grype:latest AS grype
-FROM $DOCKER_REGISTRY/tools/docker/alpine:latest AS loader
+
+FROM $DOCKER_REGISTRY/tools/docker/alpine/main:latest AS loader
 SHELL ["/bin/ash", "-euo", "pipefail", "-c"]
 ENV GRYPE_CHECK_FOR_APP_UPDATE="false" \
     GRYPE_DB_CACHE_DIR="/tmp/db" \
@@ -10,9 +11,9 @@ COPY --from=grype /grype /bin/grype
 RUN chmod a+x /bin/grype && \
     mkdir -p ${GRYPE_DB_CACHE_DIR} && \
     chmod -R 0777 ${GRYPE_DB_CACHE_DIR}
-ARG CACHEBUST=static
+ARG CACHEBUST
 RUN set -e; \
-    TMP="${CACHEBUST}" grype db update -v || ( echo "Update failed!"; exit 1 )
+    TMP="${CACHEBUST:-$(date -u +%s)}" grype db update -v || ( echo "Update failed!"; exit 1 )
 
 FROM grype AS runtime
 ENV GRYPE_CHECK_FOR_APP_UPDATE="false" \