One secured SMTP path, optional login, sender and reply address, failing health (#3)

Co-authored-by: Michael Czechowski <mail@librete.ch>

.gitea/workflows/build.yml

@@ -8,7 +8,20 @@ on:
     branches: [main]
 
 jobs:
+  test:
+    runs-on: ubuntu-latest
+    container:
+      image: git.librete.ch/public/runner-image:v0.2.0@sha256:f60c587d3c0b0aac04a572db5349e27672bf76baec2ce547a3dcc28cebcf1b7e
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+      - name: unit tests in the image's Python
+        run: |
+          tar -c --exclude=.git . | docker run -i --rm python:3.13.1-alpine3.20 sh -c \
+            'mkdir /w && tar -x -C /w && cd /w && pip install -q -r requirements.txt && PYTHONPATH=src python -m unittest discover -s src/tests'
+
   build:
+    needs: test
     runs-on: ubuntu-latest
     container:
       image: git.librete.ch/public/runner-image:v0.2.0@sha256:f60c587d3c0b0aac04a572db5349e27672bf76baec2ce547a3dcc28cebcf1b7e