Update GitPod config to use proper Ruby versions

.gitpod.dockerfile

@@ -0,0 +1,12 @@
+FROM gitpod/workspace-full
+USER gitpod
+
+# Define Ruby version
+ENV RUBY_VERSION=2.7.2
+ENV RUBY_WEBSITE_VERSION=3.0.3
+
+# Install the required Ruby version and set it as default
+RUN echo "rvm_gems_path=/home/gitpod/.rvm" > ~/.rvmrc
+RUN bash -lc "rvm install ruby-$RUBY_WEBSITE_VERSION"
+RUN bash -lc "rvm install ruby-$RUBY_VERSION && rvm use ruby-$RUBY_VERSION --default"
+RUN echo "rvm_gems_path=/workspace/.rvm" > ~/.rvmrc

.gitpod.yml

@@ -1,7 +1,5 @@
-# This configuration file was automatically generated by Gitpod.
-# Please adjust to your needs (see https://www.gitpod.io/docs/config-gitpod-file)
-# and commit this file to your remote git repository to share the goodness with others.
-
+image:
+  file: .gitpod.dockerfile
 tasks:
   - init: bundle install