Add github CI/CD and Gitlab CI/CD for core compilation

.github/workflows/compilation.yml

+name: CI
+
+on:
+  push:
+  pull_request:
+  repository_dispatch:
+    types: [run_build]
+
+jobs:
+  build-ps2:
+    runs-on: ubuntu-latest
+    container: ps2dev/ps2dev:latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Install dependencies
+      run: |
+        apk add build-base git bash
+
+    - name: Compile project
+      run: |
+        make platform=ps2 -j$(nproc) clean && make platform=ps2 -j$(nproc)
+
+    - name: Get short SHA
+      id: slug
+      run: echo "::set-output name=sha8::$(echo ${GITHUB_SHA} | cut -c1-8)"
+
+    - name: Upload artifacts
+      if: ${{ success() }}
+      uses: actions/upload-artifact@v2
+      with:
+        name: handy_libretro_ps2-${{ steps.slug.outputs.sha8 }}
+        path: handy_libretro_ps2.a

.gitlab-ci.yml

@@ -11,6 +11,8 @@ include:
     file: '/vita-static.yml'
   - project: 'libretro-infrastructure/ci-templates'
     file: '/psp-static.yml'
+  - project: 'libretro-infrastructure/ci-templates'
+    file: '/ps2-static.yml'
   - project: 'libretro-infrastructure/ci-templates'
     file: '/linux-x64.yml'
   - project: 'libretro-infrastructure/ci-templates'
@@ -71,3 +73,8 @@ libretro-build-psp:
   extends:
     - .core-defs
     - .libretro-psp-static-retroarch-master
+
+libretro-build-ps2:
+  extends:
+    - .core-defs
+    - .libretro-ps2-static-retroarch-master