Add Ubuntu 23.04 and remove 18.04

18.04 is EOL:

https://ubuntu.com/blog/ubuntu-18-04-eol-for-devices

This removes a FUSE 3 blocker.  References #1159.

.github/workflows/ci.yml

@@ -50,9 +50,9 @@ jobs:
       #
       matrix:
         container:
+          - ubuntu:23.04
           - ubuntu:22.04
           - ubuntu:20.04
-          - ubuntu:18.04
           - debian:bullseye
           - debian:buster
           - rockylinux:9

.github/workflows/linux-ci-helper.sh

@@ -80,7 +80,16 @@ PACKAGE_INSTALL_ADDITIONAL_OPTIONS=""
 SHELLCHECK_DIRECT_INSTALL=0
 AWSCLI_DIRECT_INSTALL=1
 
-if [ "${CONTAINER_FULLNAME}" = "ubuntu:22.04" ]; then
+if [ "${CONTAINER_FULLNAME}" = "ubuntu:23.04" ]; then
+    PACKAGE_MANAGER_BIN="apt-get"
+    PACKAGE_UPDATE_OPTIONS="update -y -qq"
+    PACKAGE_INSTALL_OPTIONS="install -y"
+
+    INSTALL_PACKAGES="autoconf autotools-dev default-jre-headless fuse libfuse-dev libcurl4-openssl-dev libxml2-dev locales-all mime-support libtool pkg-config libssl-dev attr curl python3-pip unzip"
+    INSTALL_CHECKER_PKGS="cppcheck shellcheck"
+    INSTALL_CHECKER_PKG_OPTIONS=""
+
+elif [ "${CONTAINER_FULLNAME}" = "ubuntu:22.04" ]; then
     PACKAGE_MANAGER_BIN="apt-get"
     PACKAGE_UPDATE_OPTIONS="update -y -qq"
     PACKAGE_INSTALL_OPTIONS="install -y"