fix(6706): pack creates sub-directories (yarnpkg#6707)

## What's the problem this PR addresses?

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<!-- Link all issues that it closes. (Closes/Resolves #xxxx.) -->

It creates missing sub-directories instead of crashing; closes yarnpkg#6706.

## How did you fix it?

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Added `await xfs.mkdirpPromise(ppath.dirname(target))` before packing

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---------

Co-authored-by: Maël Nison <nison.mael@gmail.com>

Author: GauBen

.yarn/versions/c530da1b.yml

@@ -0,0 +1,24 @@
+releases:
+  "@yarnpkg/cli": patch
+  "@yarnpkg/plugin-pack": patch
+
+declined:
+  - "@yarnpkg/plugin-compat"
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-dlx"
+  - "@yarnpkg/plugin-essentials"
+  - "@yarnpkg/plugin-init"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-nm"
+  - "@yarnpkg/plugin-npm"
+  - "@yarnpkg/plugin-npm-cli"
+  - "@yarnpkg/plugin-patch"
+  - "@yarnpkg/plugin-pnp"
+  - "@yarnpkg/plugin-pnpm"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/builder"
+  - "@yarnpkg/core"
+  - "@yarnpkg/doctor"

packages/acceptance-tests/pkg-tests-specs/sources/commands/pack.test.js

@@ -822,6 +822,21 @@ describe(`Commands`, () => {
       }),
     );
 
+    test(
+      `it should create missing directories when using \`--out\``,
+      makeTemporaryEnv({
+        name: `@scope/test`,
+        version: `0.0.1`,
+      }, async ({path, run, source}) => {
+        await xfs.mkdirpPromise(path);
+
+        await run(`install`);
+
+        await run(`pack`, `--out`, `subdir/my-package.tgz`, {cwd: path});
+        expect(xfs.existsSync(`${path}/subdir/my-package.tgz`)).toEqual(true);
+      }),
+    );
+
     test(
       `it should not include any extra files when the "files" field is empty`,
       makeTemporaryEnv({

packages/plugin-pack/sources/commands/pack.ts

@@ -90,6 +90,8 @@ export default class PackCommand extends BaseCommand {
 
         if (!this.dryRun) {
           const pack = await packUtils.genPackStream(workspace, files);
+
+          await xfs.mkdirPromise(ppath.dirname(target), {recursive: true});
           const write = xfs.createWriteStream(target);
 
           pack.pipe(write);