Add Github workflow files for automated testing action

.github/workflows/all.yml

@@ -0,0 +1,28 @@
+name: Build and test the aws jslib against a Localstack instance
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Install Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.x
+
+      - name: Install k6
+        run: go install go.k6.io/k6@latest
+
+      - name: Build the stack
+        run: docker-compose up -d
+
+      - name: Wait for the localstack scripts to have been applied
+        run: sleep 30
+
+      - name: Install npm packages
+        run: npm install
+
+      - name: Test
+        run: npm run webpack && k6 run tests/index.js