✨ feat(update-portainer-ce): Preserve current Portainer ports (#5)

This change ensures that the new Portainer container is created with the same ports as the
current configuration. It first checks the existing Portainer container to get the
current port mappings, and then uses those values when starting the new container.
This way, clients do not need to update any of their configurations when the Portainer
version is updated.

update-portainer-ce/run.sh

@@ -71,6 +71,13 @@ get_current_version() {
     fi
 }
 
+# Function to get current Portainer ports
+get_current_ports() {
+    local ports
+    ports=$(docker inspect --format='{{range $p, $conf := .NetworkSettings.Ports}}{{$p}}={{(index $conf 0).HostPort}} {{end}}' portainer 2>/dev/null)
+    echo "$ports"
+}
+
 # Function to get the last three Portainer versions
 get_last_three_versions() {
     curl -s https://api.github.com/repos/portainer/portainer/releases | grep -m 3 '"tag_name":' | awk -F'"' '{print $4}'
@@ -92,6 +99,19 @@ remove_existing_images() {
 # Get current Portainer version
 current_version=$(get_current_version)
 
+# Get current Portainer ports
+current_ports=$(get_current_ports)
+
+# Set default ports if none are found
+port1="8000:8000"
+port2="9443:9443"
+
+if [[ ! -z "$current_ports" ]]; then
+    # Extract ports from the current configuration
+    port1=$(echo "$current_ports" | grep -o '8000/tcp=[0-9]*' | sed 's/tcp=/:/')
+    port2=$(echo "$current_ports" | grep -o '9443/tcp=[0-9]*' | sed 's/tcp=/:/')
+fi
+
 # Get the last three versions
 mapfile -t versions < <(get_last_three_versions)
 
@@ -165,11 +185,11 @@ echo "Pulling Portainer image version $version_to_install..."
 docker pull portainer/portainer-ce:$version_to_install
 check_command "Failed to pull Portainer image"
 
-# Create and start a new Portainer container
+# Create and start a new Portainer container with the same ports
 echo "Creating and starting a new Portainer container..."
 docker run -d \
-    -p 8000:8000 \
-    -p 9443:9443 \
+    -p $port1 \
+    -p $port2 \
     --name portainer \
     --restart always \
     -v /var/run/docker.sock:/var/run/docker.sock \