Added error handling for cache reset function

Makes sure the Ghost process does not blow up in case there's an error in
communication with Redis

ghost/adapter-cache-redis/lib/AdapterCacheRedis.js

@@ -144,9 +144,13 @@ class AdapterCacheRedis extends BaseCacheAdapter {
      * Reset the cache by deleting everything from redis
      */
     async reset() {
-        const keys = await this.#getKeys();
-        for (const key of keys) {
-            await this.cache.del(key);
+        try {
+            const keys = await this.#getKeys();
+            for (const key of keys) {
+                await this.cache.del(key);
+            }
+        } catch (err) {
+            logging.error(err);
         }
     }
 

ghost/adapter-cache-redis/test/adapter-cache-redis.test.js

@@ -1,8 +1,13 @@
 const assert = require('assert/strict');
 const sinon = require('sinon');
+const logging = require('@tryghost/logging');
 const RedisCache = require('../index');
 
 describe('Adapter Cache Redis', function () {
+    beforeEach(function () {
+        sinon.stub(logging, 'error');
+    });
+
     afterEach(function () {
         sinon.restore();
     });
@@ -82,4 +87,24 @@ describe('Adapter Cache Redis', function () {
             assert.equal(redisCacheInstanceStub.set.args[0][0], 'testing-prefix:key-here');
         });
     });
+
+    describe('reset', function () {
+        it('catches an error when thrown during the reset', async function () {
+            const redisCacheInstanceStub = {
+                get: sinon.stub().resolves('value from cache'),
+                store: {
+                    getClient: sinon.stub().returns({
+                        on: sinon.stub()
+                    })
+                }
+            };
+            const cache = new RedisCache({
+                cache: redisCacheInstanceStub
+            });
+
+            await cache.reset();
+
+            assert.ok(logging.error.calledOnce, 'error was logged');
+        });
+    });
 });