Update Dockerfile

Dockerfile

@@ -1,5 +1,6 @@
 # Use the specified Debian image
-FROM docker.io/library/debian:latest
+FROM debian:stable-slim
+
 # Install OpenVPN and Easy-RSA
 RUN apt-get update && \
     apt-get install -y openvpn easy-rsa iptables && \
@@ -9,13 +10,14 @@ RUN apt-get update && \
 COPY openvpn-server.conf /etc/openvpn/server.conf
 
 # Initialize Easy-RSA PKI
-RUN make-cadir /etc/openvpn/vars && \
-    cd /etc/openvpn/vars && \
-    . ./vars && \
-    ./clean-all && \
-    ./build-ca --batch && \
-    ./build-key-server --batch server && \
-    ./build-dh --batch
+RUN mkdir -p /etc/openvpn/pki && \
+    cp -r /usr/share/easy-rsa/* /etc/openvpn/pki && \
+    cd /etc/openvpn/pki && \
+    ./easyrsa init-pki && \
+    ./easyrsa --batch --req-cn=YourServerName build-ca nopass && \
+    ./easyrsa --batch gen-dh && \
+    ./easyrsa --batch --req-cn=YourServerName build-server-full server nopass && \
+    openvpn --genkey secret ta.key
 
 # Expose port 1194 for OpenVPN
 EXPOSE 1194/udp