chore(ci): add Docker BuildKit examples, .dockerignore, CI cache docs; tune vite config

.dockerignore

@@ -1,4 +1,28 @@
-node_modules/
+.svelte-kit
+.vite
+node_modules
+dist
+build
+.cache
+.DS_Store
+.vscode
+.idea
+.git
+.gitignore
+coverage
+tests
+documentation
+backups
+*.log
+*.bak
+*.tgz
+.env
+.env.*
+npm-debug.log
+package-lock.json.bak
+yarn-error.log
+/.cache
+/.parcel-cachenode_modules/
 build/
 .svelte-kit/
 .git/