Moved Cache-Control middleware to separate package

refs https://github.com/TryGhost/Toolbox/issues/363

- this middleware is standalone and I suspect we're going to be touching
  it further when we work on Ghost's caching in the near future

ghost/core/core/server/web/shared/middleware/index.js

@@ -8,7 +8,7 @@ module.exports = {
     },
 
     get cacheControl() {
-        return require('./cache-control');
+        return require('@tryghost/mw-cache-control');
     },
 
     get prettyUrls() {

ghost/core/package.json

@@ -92,6 +92,7 @@
     "@tryghost/metrics": "1.0.15",
     "@tryghost/minifier": "0.0.0",
     "@tryghost/mw-api-version-mismatch": "0.0.0",
+    "@tryghost/mw-cache-control": "0.0.0",
     "@tryghost/mw-error-handler": "0.0.0",
     "@tryghost/mw-session-from-token": "0.0.0",
     "@tryghost/mw-vhost": "0.0.0",

ghost/mw-cache-control/.eslintrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+    plugins: ['ghost'],
+    extends: [
+        'plugin:ghost/node'
+    ]
+};

ghost/mw-cache-control/README.md

@@ -0,0 +1,23 @@
+# Mw Cache Control
+
+Cache-Control middleware for Ghost
+
+
+## Usage
+
+
+## Develop
+
+This is a monorepo package.
+
+Follow the instructions for the top-level repo.
+1. `git clone` this repo & `cd` into it as usual
+2. Run `yarn` to install top-level dependencies.
+
+
+
+## Test
+
+- `yarn lint` run just eslint
+- `yarn test` run lint and tests
+

ghost/mw-cache-control/index.js

@@ -0,0 +1 @@
+module.exports = require('./lib/mw-cache-control');

ghost/mw-cache-control/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "@tryghost/mw-cache-control",
+  "version": "0.0.0",
+  "repository": "https://github.com/TryGhost/Ghost/tree/main/packages/mw-cache-control",
+  "author": "Ghost Foundation",
+  "private": true,
+  "main": "index.js",
+  "scripts": {
+    "dev": "echo \"Implement me!\"",
+    "test": "NODE_ENV=testing c8 --all --check-coverage --reporter text --reporter cobertura mocha './test/**/*.test.js'",
+    "lint:code": "eslint *.js lib/ --ext .js --cache",
+    "lint": "yarn lint:code && yarn lint:test",
+    "lint:test": "eslint -c test/.eslintrc.js test/ --ext .js --cache"
+  },
+  "files": [
+    "index.js",
+    "lib"
+  ],
+  "devDependencies": {
+    "c8": "7.12.0",
+    "mocha": "10.0.0",
+    "should": "13.2.3",
+    "sinon": "14.0.0"
+  },
+  "dependencies": {
+    "lodash": "4.17.21"
+  }
+}

ghost/mw-cache-control/test/.eslintrc.js

@@ -0,0 +1,6 @@
+module.exports = {
+    plugins: ['ghost'],
+    extends: [
+        'plugin:ghost/test'
+    ]
+};

ghost/mw-cache-control/test/cache-control.test.js

@@ -1,8 +1,9 @@
 const should = require('should');
 const sinon = require('sinon');
-const cacheControl = require('../../../../../../core/server/web/shared/middleware/cache-control');
 
-describe('Middleware: cacheControl', function () {
+const cacheControl = require('../');
+
+describe('Cache-Control middleware', function () {
     let res;
 
     beforeEach(function () {