feat: add support for rhel & coreos 8 (typegoose#288)

* Add support for rhel & coreos 8

* fix: update the static latest binary to be 4.0.14

Rhel 8 and coreos 8 only have builds starting from that static build

Author: GlenTiki

packages/mongodb-memory-server-core/src/util/MongoBinary.ts

@@ -13,10 +13,10 @@ import debug from 'debug';
 
 const log = debug('MongoMS:MongoBinary');
 
-// TODO: return back `latest` version when it will be fixed in MongoDB distro (for now use 4.0.3 😂)
+// TODO: return back `latest` version when it will be fixed in MongoDB distro (for now use 4.0.14 😂)
 // More details in https://github.com/nodkz/mongodb-memory-server/issues/131
 // export const LATEST_VERSION = 'latest';
-export const LATEST_VERSION: string = '4.0.3';
+export const LATEST_VERSION: string = '4.0.14';
 
 export interface MongoBinaryCache {
   [version: string]: string;

packages/mongodb-memory-server-core/src/util/MongoBinaryDownloadUrl.ts

@@ -209,7 +209,9 @@ export default class MongoBinaryDownloadUrl {
     let name = 'rhel';
     const { release } = os;
     if (release) {
-      if (/^7/.test(release)) {
+      if (/^8/.test(release)) {
+        name += '80';
+      } else if (/^7/.test(release)) {
         name += '70';
       } else if (/^6/.test(release)) {
         name += '62';