Merge newer Postfix implementation into Gitea and update Alpine

Dockerfile

@@ -1,16 +1,16 @@
-FROM docker.io/library/alpine:3.19
+FROM docker.io/library/alpine:3.24
 
 # Variables for Labels
-ARG VENDOR="your-org"
+ARG VENDOR="k2patel"
 ARG COMPONENT="postfix-relay"
 ARG BUILD_DATE
-ARG GIT_REPO="https://github.com/your-org/docker-postfix"
+ARG GIT_REPO="https://git.k2patel.in/k2patel/docker-postfix"
 ARG VCS_REF
 ARG VERSION="2.0"
 ARG NAME="dockerized-${COMPONENT}"
 ARG DESCRIPTION="Postfix SMTP relay supporting multiple providers (Maileroo, Mailtrap, SendGrid)"
-ARG DOCUMENTATION="https://github.com/your-org/docker-postfix"
-ARG AUTHOR="Your Name <your-email@example.com>"
+ARG DOCUMENTATION="https://git.k2patel.in/k2patel/docker-postfix"
+ARG AUTHOR="k2patel"
 ARG LICENSE="MIT"
 
 # Labels