feat(docker): add script to echo deprecation warning conditionally e.g. for Dockerhub images

Author: demenech

Dockerfile

@@ -55,8 +55,11 @@ WORKDIR /app
 
 ENV UWSGI_MODULE "giftless.wsgi_entrypoint"
 
-ENTRYPOINT ["tini", "uwsgi", "--"]
-CMD ["-s", "127.0.0.1:5000", "-M", "-T", "--threads", "2", "-p", "2", \
+ARG IS_DOCKERHUB
+ENV IS_DOCKERHUB=$IS_DOCKERHUB
+
+ENTRYPOINT ["scripts/docker-prerun.sh"]
+CMD ["tini", "uwsgi", "--", "-s", "127.0.0.1:5000", "-M", "-T", "--threads", "2", "-p", "2", \
      "--manage-script-name", "--callable", "app"]
 
 # TODO remove this STOPSIGNAL override after uwsgi>=2.1

scripts/docker-prerun.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# ANSI color codes
+RED='\033[1;31m'
+YELLOW='\033[1;33m'
+RESET='\033[0m'
+
+if [ "$IS_DOCKERHUB" = true ]; then
+    echo "${RED}**********************************************${RESET}"
+    echo "${YELLOW}WARNING:${RESET} This Docker image from docker.io is deprecated!"
+    echo "${YELLOW}It will no longer be maintained. Please use ghcr.io/datopian/giftless."
+    echo "${YELLOW}Refer to https://github.com/datopian/giftless for more details."
+    echo "${RED}**********************************************${RESET}"
+fi
+
+exec "$@"