✨(widgets) import widgets code from Messages and setup Docker workflow (#33)

This adds Gaufre v2 with source, documentation, examples and built artefacts.
Also includes the feedback widget from Messages.

packages/widgets/build.js

@@ -0,0 +1,31 @@
+import { build } from 'vite'
+import { readdirSync } from 'node:fs'
+import { join } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url))
+
+const widgetsDir = join(__dirname, 'src', 'widgets')
+
+function discoverWidgets() {
+  return readdirSync(widgetsDir, { withFileTypes: true })
+    .filter(dirent => dirent.isDirectory())
+    .map(dirent => dirent.name)
+}
+
+// Run an independent build for each widget
+for (const widget of discoverWidgets()) {
+    await build({
+        build: {
+            emptyOutDir: false,
+            outDir: join(process.env.WIDGETS_OUTPUT_DIR || "", "dist"),
+            rollupOptions: {
+                input: join(widgetsDir, widget, 'main.ts'),
+                output: {
+                    entryFileNames: widget + '.js',
+                    format: 'iife'
+                }
+            }
+        },
+    })
+}