Add draft of GH workflow for basic CI test.

Signed-off-by: Simon Viénot <simon.vienot@icloud.com>

.github/workflows/tests.yaml

@@ -0,0 +1,37 @@
+name: Tests
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+
+  test-server:
+
+    name: Basic server non-regression
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Use Node.js TLS 18
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18
+
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Provide environment variables
+        run: cp environments/.en.dev.hedera environments/.env
+
+      - name: Start Hedera Local Node
+        run: npm run local-node:start
+
+      - name: Start hedera-sourcify server
+        run: npm run server:start
+
+      - name: Start test
+        run: npm run test:hedera