GitHub actions (#7035)

* Trying to setup GitHub Actions

* Try to fix the workflow steps

* Fix NODE_VERSION

* Fix services

* Fix services 2

* Fix redis service, remove docker service

* Missing npm install

* Fix Use Node.js step name

* Remove greenkeeper

* I believe we do not need this command

* Try to include postgres

* Fix postgres script

* Remove before install script

* Fix postgres before script

* Try to fix connection to postgres

* Fix postgress port

* Postgres host

* Still trying to connect on postgres

* Still trying to connect on postgres - localhost

* Split postgres in a separate job

* Add postgres healthcheck

* Set postgres just like github example

* Fix postgres scripts with new credentials

* Still trying to fix postgres connection

* Now it looks only the username is wrong

* Passing postgres password in the right way

* try to install postgis

* New attempt to install postgis

* Fix postgis image name

* Try to output tests

* We need to start mongo

* Increase tests timeout

* Fix flaky test

* Add GitHub Actions badge

* Badge as html

* Fix badge link

* Remove Travis

* try to fix coverage

* Fix flaky test

* Improve ci workflow

* Change the mongo default test version

* Fix the job name in the if clause

* Ubuntu18.0.4

* Downgrade to 4.0.21

* Fix cache keys:

* Trying with mongo 4.0.4

* Rever os and mongo versions

* remove latest node

README.md

@@ -10,7 +10,9 @@
 
 <p align="center">
     <a href="https://twitter.com/intent/follow?screen_name=parseplatform"><img alt="Follow on Twitter" src="https://img.shields.io/twitter/follow/parseplatform?style=social&label=Follow"></a>
-  <a href="https://travis-ci.org/parse-community/parse-server"><img alt="Build status" src="https://img.shields.io/travis/parse-community/parse-server/master.svg?style=flat"></a>
+    <a href="https://github.com/parse-community/parse-server/actions?query=workflow%3Aci+branch%3Amaster">
+      <img alt="Build status" src="https://github.com/parse-community/parse-server/workflows/ci/badge.svg?branch=master">
+    </a>
     <a href="https://codecov.io/github/parse-community/parse-server?branch=master"><img alt="Coverage status" src="https://img.shields.io/codecov/c/github/parse-community/parse-server/master.svg"></a>
     <a href="https://www.npmjs.com/package/parse-server"><img alt="npm version" src="https://img.shields.io/npm/v/parse-server.svg?style=flat"></a>
     <a href="https://community.parseplatform.org/"><img alt="Join the conversation" src="https://img.shields.io/discourse/https/community.parseplatform.org/topics.svg"></a>