Create GH actions file, remove travis file.

Fixes #502

.github/workflows/ci-actions.yml

@@ -0,0 +1,34 @@
+name: Jakarta Contexts and Dependency Injection CI
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    name: "Build CDI - JDK ${{matrix.java.name}}"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        java:
+          - {
+            name: "11",
+            java-version: 11,
+          }
+          - {
+            name: "16",
+            java-version: 16,
+          }
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK ${{ matrix.java.name }}
+        uses: actions/setup-java@v1.4.3
+        with:
+          java-version: ${{ matrix.java.java-version }}
+      - name: "Maven install"
+        run: |
+          mvn -Pstaging install -DskipTests=true -B -V
+      - name: "Maven test"
+        run: |
+          mvn -Pstaging test -B