ci: fix ignored errors within appraisal loop (#1103)

The existing loop over appraisals for a gem is swallowing any error exits returned by commands within the loop.

Resolves #1097. The specific error mentioned in that issue for failure to bundle install pg 1.2 was fixed in #1108. This change fixes the appraisal loop.

Fix appraisal loop swallowing errors:

* add an explicit exit to the appraisal loop if any command in the chain fails so that the CI step also fails

Fix other errors that were being swallowed:

* add a workaround for GEM_HOME file permission problems during bundle install
  *  introduced to GitHub runner images sometime early July 2024
* bound which version of Ruby the gruf gem tests are run against
  * its gemspec includes upper bounds on Ruby versions which cause bundler install to fail under newer Rubies

.github/actions/test_gem/action.yml

@@ -82,6 +82,13 @@ runs:
         ruby-version: "${{ inputs.ruby }}"
         bundler:  "latest"
         working-directory: "${{ steps.setup.outputs.gem_dir }}"
+    # Perms workaround. See https://github.com/actions/runner-images/issues/10215
+    - name: Fix GEM_HOME permissions on GitHub Actions Runner
+      if: "${{ steps.setup.outputs.appraisals == 'true' }}"
+      shell: bash
+      run: |
+        # 🛠️😭 Fix GEM_HOME permissions 😭🛠️
+        chmod -R o-w $(gem env home)
     - name: Install dependencies and generate appraisals
       if: "${{ steps.setup.outputs.appraisals == 'true' }}"
       shell: bash
@@ -100,7 +107,7 @@ runs:
             echo "::group::🔎 Appraising ${i}"
             BUNDLE_GEMFILE=gemfiles/${i}.gemfile bundle install --quiet --jobs=3 --retry=4 && \
             BUNDLE_GEMFILE=gemfiles/${i}.gemfile bundle show && \
-            BUNDLE_GEMFILE=gemfiles/${i}.gemfile bundle exec rake test
+            BUNDLE_GEMFILE=gemfiles/${i}.gemfile bundle exec rake test || exit
             echo "::endgroup::"
           done
         else

instrumentation/gruf/Appraisals

@@ -4,14 +4,22 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-appraise 'gruf-2.17' do
-  gem 'gruf', '~> 2.17.0'
+if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('3.3')
+  appraise 'gruf-2.17' do
+    gem 'gruf', '~> 2.17.0'
+  end
+
+  appraise 'gruf-2.18' do
+    gem 'gruf', '~> 2.18.0'
+  end
 end
 
-appraise 'gruf-2.18' do
-  gem 'gruf', '~> 2.18.0'
+if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('3.4')
+  appraise 'gruf-2.19' do
+    gem 'gruf', '~> 2.19.0'
+  end
 end
 
-appraise 'gruf-2.19' do
-  gem 'gruf', '~> 2.19.0'
+appraise 'gruf-latest' do
+  gem 'gruf'
 end