added test suites

.github/workflows/test-libdatetime.yml

@@ -0,0 +1,27 @@
+name: CI test
+
+# Only trigger, when the build workflow succeeded
+on:
+  workflow_run:
+    workflows: ["Linux CI build"]
+    types:
+      - completed
+
+jobs:
+  notify:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: install scons
+      run: sudo apt-get install -y scons
+
+    - name: install (latest) eigen
+      run: sudo apt install libeigen3-dev
+
+    - name: build (tests), gcc
+      run: scons test=1
+
+    - name: Run test suites
+      run: python3 run_test_suite.py --progs-dir=test