Add script for testing rubygem published package in alpine and debian.

package-testing/ruby-sdk-relay/README.md

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+## Ruby SDK Testing
+
+This directory contains scripts for testing the Ruby SDK in various environments.
+
+### Test Ruby Gems Installation
+
+Verifies that the Ruby SDK can be installed from RubyGems in a variety of environments.
+
+The `test-rubygems-install.sh` script builds Docker images for Alpine and Debian and runs the test script inside each container.
+
+You should see output like the following if the tests pass:
+
+```
+Successfully installed eppo-server-sdk-3.3.0-aarch64-linux
+1 gem installed
+Installed version: 3.3.0
+✅ Installation successful in debian environment
+```

package-testing/ruby-sdk-relay/published-versions/Dockerfile.rubygems.alpine

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+FROM ruby:3.3-alpine
+
+# Install bash
+RUN apk add --no-cache bash
+
+# Create a test user
+RUN adduser -D testuser
+
+# Copy script and set permissions while still root
+COPY test-gem.sh /home/testuser/
+RUN chmod +x /home/testuser/test-gem.sh && \
+    chown testuser:testuser /home/testuser/test-gem.sh
+
+# Switch to test user
+USER testuser
+WORKDIR /home/testuser
+
+CMD ["bash", "/home/testuser/test-gem.sh"]

package-testing/ruby-sdk-relay/published-versions/Dockerfile.rubygems.debian

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+FROM ruby:3.3-slim-bullseye
+
+# Create a test user
+RUN useradd -m testuser
+
+# Copy script and set permissions while still root
+COPY test-gem.sh /home/testuser/
+RUN chmod +x /home/testuser/test-gem.sh && \
+    chown testuser:testuser /home/testuser/test-gem.sh
+
+# Switch to test user
+USER testuser
+WORKDIR /home/testuser
+
+CMD ["bash", "/home/testuser/test-gem.sh"]

package-testing/ruby-sdk-relay/published-versions/test-gem.sh

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+#!/bin/bash
+
+# Install the gem and verify it works
+gem install eppo-server-sdk
+ruby -r eppo_client -e 'puts "Installed version: #{EppoClient::VERSION}"' 

package-testing/ruby-sdk-relay/test-rubygems-install.sh

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+#!/bin/bash
+
+# Default environment if none specified
+ENV=${1:-"all"}
+
+# Constants
+DOCKERFILE_FORMAT="Dockerfile.rubygems"
+DOCKER_TAG_PREFIX="rubygems-test"
+TEST_DIRECTORY="published-versions"
+
+# Ensure we're in the correct directory
+cd "$(dirname "$0")"
+
+# Ensure test script exists
+if [ ! -f "$TEST_DIRECTORY/test-gem.sh" ]; then
+    echo "Error: $TEST_DIRECTORY/test-gem.sh not found"
+    exit 1
+fi
+
+# Function to test in specific environment
+test_environment() {
+    local env=$1
+    echo "Testing installation in $env environment..."
+
+    # Build from the published-versions directory where both Dockerfile and test-gem.sh are located
+    docker build -t "$DOCKER_TAG_PREFIX-$env" -f "$TEST_DIRECTORY/$DOCKERFILE_FORMAT.$env" "$TEST_DIRECTORY"
+    docker run --rm "$DOCKER_TAG_PREFIX-$env"
+
+    local result=$?
+    if [ $result -eq 0 ]; then
+        echo "✅ Installation successful in $env environment"
+    else
+        echo "❌ Installation failed in $env environment"
+    fi
+    return $result
+}
+
+# Run tests based on environment parameter
+case $ENV in
+    "alpine")
+        test_environment "alpine"
+        ;;
+    "debian")
+        test_environment "debian"
+        ;;
+    "all")
+        failed=0
+        test_environment "alpine" || failed=1
+        test_environment "debian" || failed=1
+        exit $failed
+        ;;
+    *)
+        echo "Unsupported environment: $ENV"
+        echo "Supported environments: alpine, debian, all"
+        exit 1
+        ;;
+esac