feat: Implement Docker version reporting by extracting git tag to an environment variable for API consumption.

scripts/docker-entrypoint.sh

@@ -1,6 +1,12 @@
 #!/bin/sh
 set -e
 
+# Export version if available
+if [ -f /app/version.txt ]; then
+    export APP_VERSION=$(cat /app/version.txt)
+    echo "App version: $APP_VERSION"
+fi
+
 echo "Starting deployment..."
 
 # Run migrations