Add Matrix Build Support to Github Autobuild CI

**User Story**

Similar to https://github.com/bitshares/bitshares-core/issues/1233, Github Autobuild CI supports matrix too.

By setting up matrix build more issues could be found sooner.

On the other hand, it's more cost-efficient to invest resources into necessary matters only. For CI, the most important is to support the building environments used by the majority.

**Impacts**
Describe which portion(s) of BitShares Core may be impacted by your request. Please tick at least one box.
- [ ] API (the application programming interface)
- [ ] Build (the build process or something prior to compiled code)
- [ ] CLI (the command line wallet)
- [ ] Deployment (the deployment process after building such as Docker, Travis, etc.)
- [ ] DEX (the Decentralized EXchange, market engine, etc.)
- [ ] P2P (the peer-to-peer network for transaction/block propagation)
- [ ] Performance (system or user efficiency, etc.)
- [ ] Protocol (the blockchain logic, consensus, validation, etc.)
- [ ] Security (the security of system or user data, etc.)
- [ ] UX (the User Experience)
- [ ] Other (please add below)

**Additional Context (optional)**
Add any other context about your request here.

## CORE TEAM TASK LIST
- [ ] Evaluate / Prioritize Feature Request
- [ ] Refine User Stories / Requirements
- [ ] Define Test Cases
- [ ] Design / Develop Solution
- [ ] Perform QA/Testing
- [ ] Update Documentation

Start by inspecting the existing GitHub Autobuild CI configuration and compare the requested approach with bitshares/bitshares-core#1233. Identify the build environments that should form the matrix, then validate that each selected environment completes successfully and that the CI catches issues earlier without unnecessary builds.

Written by the indexing model from the issue text.