feat: add bun_no_cache configuration option to disable Bun cache during package installation

packages/opencode/src/bun/index.ts

@@ -4,6 +4,7 @@ import { Log } from "../util/log"
 import path from "path"
 import { NamedError } from "@opencode-ai/util/error"
 import { readableStreamToText } from "bun"
+import { Config } from "../config/config"
 import { createRequire } from "module"
 import { Lock } from "../util/lock"
 
@@ -76,6 +77,12 @@ export namespace BunProc {
     // Build command arguments
     const args = ["add", "--force", "--exact", "--cwd", Global.Path.cache, pkg + "@" + version]
 
+    // Add --no-cache flag if configured
+    const config = await Config.get()
+    if (config.bun_no_cache) {
+      args.push("--no-cache")
+    }
+
     // Let Bun handle registry resolution:
     // - If .npmrc files exist, Bun will use them automatically
     // - If no .npmrc files exist, Bun will default to https://registry.npmjs.org

packages/opencode/src/config/config.ts

@@ -671,6 +671,10 @@ export namespace Config {
           url: z.string().optional().describe("Enterprise URL"),
         })
         .optional(),
+      bun_no_cache: z
+        .boolean()
+        .optional()
+        .describe("Disable Bun cache when installing packages (adds --no-cache flag)"),
       experimental: z
         .object({
           hook: z