Adding github actions workflows

.github/workflows/pxt-buildmain.yml

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+name: pxt-buildmain
+
+on:
+  push:
+    branches:
+      - 'master'
+      - 'main'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [8.x]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: npm install
+        run: |
+          sudo apt-get install xvfb
+          sudo npm install -g pxt
+          npm install
+      - name: pxt travis
+        run: |
+          pxt travis
+        env:
+          CROWDIN_KEY: ${{ secrets.CROWDIN_KEY }}
+          PXT_ACCESS_TOKEN: ${{ secrets.PXT_ACCESS_TOKEN }}
+          PXT_RELEASE_REPO: ${{ secrets.PXT_RELEASE_REPO }}
+          NPM_ACCESS_TOKEN: ${{ secrets.NPM_ACCESS_TOKEN }}
+          CHROME_BIN: chromium-browser
+          DISPLAY: :99.0
+          CI: true

.github/workflows/pxt-buildpr.yml

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+name: pxt-buildpr
+
+on: [pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [8.x]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: npm install
+        run: |
+          sudo apt-get install xvfb
+          sudo npm install -g pxt
+          npm install
+      - name: pxt travis
+        run: |
+          pxt travis
+        env:
+          CHROME_BIN: chromium-browser
+          DISPLAY: :99.0
+          CI: true

.github/workflows/pxt-buildpush.yml

@@ -0,0 +1,39 @@
+name: pxt-buildpush
+
+on:
+  push:
+    # main/master has its own build that includes the crowdin key
+    branches-ignore:
+      - 'main'
+      - 'master'
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [8.x]
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: npm install
+        run: |
+          sudo apt-get install xvfb
+          sudo npm install -g pxt
+          npm install
+      - name: pxt travis
+        run: |
+          pxt travis
+        env:
+          PXT_ACCESS_TOKEN: ${{ secrets.PXT_ACCESS_TOKEN }}
+          PXT_RELEASE_REPO: ${{ secrets.PXT_RELEASE_REPO }}
+          NPM_ACCESS_TOKEN: ${{ secrets.NPM_ACCESS_TOKEN }}
+          CHROME_BIN: chromium-browser
+          DISPLAY: :99.0
+          CI: true