Adds .dockerignore file

WHAT: Creates a `.dockerignore` file to exclude unnecessary files and directories from the Docker image.

WHY: Reduces the size of the Docker image and improves build times by preventing the inclusion of development-related artifacts, node modules, and other irrelevant data.

HOW: Adds a `.dockerignore` file with standard exclusions like `node_modules`, development build outputs, temporary files, and hidden system files.

.dockerignore

@@ -0,0 +1,20 @@
+node_modules
+dist-dev
+.vite
+.pnpm-store
+**/.DS_Store
+**/Thumbs.db
+**/.env*
+**/npm-debug.log*
+**/yarn-debug.log*
+**/yarn-error.log*
+**/pnpm-debug.log*
+**/.turbo
+**/.cache
+**/.next
+**/coverage
+**/build
+**/tmp
+**/temp
+**/.git
+