Update ubuntu Docker tag to v24

This reverts commit ce2f1a966e.

Dockerfile

@@ -1,15 +1,21 @@
-FROM ubuntu:18.04
+FROM ubuntu:24.04
 
 ARG DEBIAN_FRONTEND="noninteractive"
 
-RUN set -ex; \
+# Install prerequisites and curl
-    apt-get update && \
+RUN apt-get update && apt-get -y install curl software-properties-common && \
-    apt-get -y install software-properties-common && \
     add-apt-repository -u ppa:deluge-team/stable && \
-    apt-get update && apt-get -y install dumb-init iputils-ping dnsutils bash jq net-tools openvpn curl ufw deluged deluge-web p7zip-full unrar unzip && \
+    apt-get update && \
-    echo "Cleanup"; \
+    # Download and install dumb-init manually based on architecture
+    arch=$(dpkg --print-architecture) && \
+    if [ "$arch" = "arm64" ]; then arch="aarch64"; fi && \
+    curl -Lo /tmp/dumb-init.deb "https://github.com/Yelp/dumb-init/releases/download/v1.2.5/dumb-init_1.2.5_${arch}.deb" && \
+    dpkg -i /tmp/dumb-init.deb && rm -f /tmp/dumb-init.deb && \
+    # Install other dependencies
+    apt-get -y install iputils-ping dnsutils bash jq net-tools openvpn curl ufw deluged deluge-web p7zip-full unrar unzip && \
+    echo "Cleanup" && \
     rm -rf /tmp/* /var/lib/apt/lists/* /var/tmp/* && \
-    echo "Adding user"; \
+    echo "Adding user" && \
     groupmod -g 1000 users && \
     useradd -u 911 -U -d /config -s /bin/false abc && \
     usermod -G users abc
@@ -51,4 +57,4 @@ HEALTHCHECK --interval=1m CMD /etc/scripts/healthcheck.sh
 # Deluge Deamon and web
 EXPOSE 8112 58846
 
-CMD ["dumb-init", "/etc/openvpn/init.sh"]
+CMD ["/usr/local/bin/dumb-init", "/etc/openvpn/init.sh"]