Setup GitHub Actions

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        haxe-version:
+          - "3.4.7"
+          - stable
+          - nightly
+        target: 
+          - node
+
+    steps:
+    - name: Check out repo
+      uses: actions/checkout@v2
+    
+    - name: Get yarn cache directory path
+      id: yarn-cache-dir-path
+      run: echo "::set-output name=dir::$(yarn cache dir)"
+
+    - name: Cache Yarn
+      uses: actions/cache@v1
+      with:
+        path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-
+        
+    - name: Cache Haxe
+      uses: actions/cache@v1
+      with:
+        path: ~/haxe
+        key: haxe
+        
+    - name: Install Lix
+      uses: lix-pm/setup-lix@master
+      
+    - name: Install Haxe
+      run: lix install haxe ${{ matrix.haxe-version }}
+    
+    - name: Install Haxe Libraries
+      run: lix download
+      
+    - name: Run Test
+      run: lix run travix ${{ matrix.target }}
+
+  release:
+    runs-on: ubuntu-latest
+    needs: test
+    if: startsWith(github.ref, 'refs/tags/') # consider using the "release" event. see: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#release
+    
+    steps:
+    - name: Check out repo
+      uses: actions/checkout@v2
+    
+    - name: Get yarn cache directory path
+      id: yarn-cache-dir-path
+      run: echo "::set-output name=dir::$(yarn cache dir)"
+
+    - name: Cache Yarn
+      uses: actions/cache@v1
+      with:
+        path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+        key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-yarn-
+        
+    - name: Cache Haxe
+      uses: actions/cache@v1
+      with:
+        path: ~/haxe
+        key: haxe
+        
+    - name: Install Lix
+      uses: lix-pm/setup-lix@master
+      
+    - name: Install Haxe
+      run: lix install haxe stable
+    
+    - name: Install Haxe Libraries
+      run: lix download
+      
+    - name: Release to Haxelib
+      run: lix run travix release
+      env:
+        HAXELIB_AUTH: ${{ secrets.HAXELIB_AUTH }}
+