Upgrade to Ruby 3.3.8 (and cleanup ruby 3.1 remainders). (#434)

* Cleanups from Ruby 3.1 removal.

* Upgrade to Ruby 3.3.8

Author: ajhodgson

CHANGELOG.md

@@ -2,6 +2,7 @@
  * Removed Ruby 3.1 (EOL: 2024-03-26)
  * Upgraded Node 20 LTS -> 22 LTS.
  * Upgraded image base to phusion/baseimage:noble-1.0.1
+ * Upgraded to Ruby 3.3.8 (from 3.3.7).
  * 
 
 ## 3.1.3 (release date: 2025-04-04)

README.md

@@ -94,7 +94,7 @@ Basics (learn more at [baseimage-docker](http://phusion.github.io/baseimage-dock
 
 Language support:
 
- * Ruby 3.1.7, 3.2.8, 3.3.7, 3.4.2 and JRuby 9.3.15.0 and 9.4.9.0.
+ * Ruby 3.2.8, 3.3.8, 3.4.2 and JRuby 9.3.15.0 and 9.4.9.0.
    * RVM is used to manage Ruby versions. [Why RVM?](#why_rvm)
    * 3.4.2 is configured as the default.
    * JRuby is installed from source, but we register an APT entry for it.
@@ -129,7 +129,6 @@ Passenger-docker consists of several images, each one tailor made for a specific
 
 **Ruby images**
 
- * `phusion/passenger-ruby31` - Ruby 3.1.
  * `phusion/passenger-ruby32` - Ruby 3.2.
  * `phusion/passenger-ruby33` - Ruby 3.3.
  * `phusion/passenger-ruby34` - Ruby 3.4.
@@ -214,7 +213,6 @@ CMD ["/sbin/my_init"]
 #RUN /pd_build/nodejs.sh 20
 #
 #   Ruby support
-#RUN /pd_build/ruby-3.1.*.sh
 #RUN /pd_build/ruby-3.2.*.sh
 #RUN /pd_build/ruby-3.3.*.sh
 #RUN /pd_build/ruby-3.4.*.sh
@@ -280,8 +278,6 @@ server {
     passenger_ruby /usr/bin/ruby3.3;
     # For Ruby 3.2
     passenger_ruby /usr/bin/ruby3.2;
-    # For Ruby 3.1
-    passenger_ruby /usr/bin/ruby3.1;
 
     # For Python ie. Django
     passenger_app_type wsgi;
@@ -452,12 +448,10 @@ We use [RVM](https://rvm.io/) to install and to manage Ruby interpreters. Becaus
 The default Ruby (what the `/usr/bin/ruby` command executes) is the latest Ruby version that you've chosen to install. You can use RVM select a different version as default.
 
 ```dockerfile
-# Ruby 3.1.7
-RUN bash -lc 'rvm --default use ruby-3.1.7'
 # Ruby 3.2.8
 RUN bash -lc 'rvm --default use ruby-3.2.8'
-# Ruby 3.3.7
-RUN bash -lc 'rvm --default use ruby-3.3.7'
+# Ruby 3.3.8
+RUN bash -lc 'rvm --default use ruby-3.3.8'
 # Ruby 3.4.2
 RUN bash -lc 'rvm --default use ruby-3.4.2'
 # JRuby 9.3.15.0
@@ -474,9 +468,9 @@ Learn more: [RVM: Setting the default Ruby](https://rvm.io/rubies/default).
 You can run any command with a specific Ruby version by prefixing it with `rvm-exec <IDENTIFIER>`. For example:
 
 ```bash
-$ rvm-exec 3.3.7 ruby -v
-Using /usr/local/rvm/gems/ruby-3.3.7
-ruby 3.3.7 (2025-01-15 revision be31f993d7) [x86_64-linux]
+$ rvm-exec 3.3.8 ruby -v
+Using /usr/local/rvm/gems/ruby-3.3.8
+ruby 3.3.8 (2025-04-09 revision b200bad6cd) [x86_64-linux]
 
 $ rvm-exec 3.4.2 ruby -v
 Using /usr/local/rvm/gems/ruby-3.4.2

image/nginx-passenger.sh

@@ -71,10 +71,6 @@ if [[ -e /usr/bin/ruby3.2 ]]; then
 	run ruby3.2 -S passenger-config build-native-support
 	run setuser app ruby3.2 -S passenger-config build-native-support
 fi
-if [[ -e /usr/bin/ruby3.1 ]]; then
-	run ruby3.1 -S passenger-config build-native-support
-	run setuser app ruby3.1 -S passenger-config build-native-support
-fi
 if [[ -e /usr/bin/jruby9.4 ]]; then
 	run jruby9.4 --dev -S passenger-config build-native-support
 	run setuser app jruby9.4 -S passenger-config build-native-support

image/ruby-3.1.7.sh

@@ -30,8 +30,6 @@ elif [[ "$known_rubies" =~ ruby-3\.3 ]]; then
 	set_rvm_default ruby-3\.3
 elif [[ "$known_rubies" =~ ruby-3\.2 ]]; then
 	set_rvm_default ruby-3\.2
-elif [[ "$known_rubies" =~ ruby-3\.1 ]]; then
-	set_rvm_default ruby-3\.1
 elif [[ "$known_rubies" =~ jruby ]]; then
 	set_rvm_default jruby
 fi