aider: Added a new workflow that builds the Docker image and runs tests inside it.

# Aider chat conversation:

USER: add a new workflow that will build the docker image and make sure the tests succeed inside it

ASSISTANT: To add a new workflow that builds the Docker image and runs tests inside it, we need to create a new GitHub Actions workflow file. Let's call it `docker-build-and-test.yml` and place it in the `.github/workflows/` directory.

Here is the *SEARCH/REPLACE block* for the new file:

```yaml
.github/workflows/docker-build-and-test.yml
<<<<<<< SEARCH

=======
name: Docker Build and Test

on:
  push:
    branches:
      - main
  pull_request:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
    - name: Check out repository
      uses: actions/checkout@v3

    - name: Build Docker image
      run: |
        docker build -t myapp:latest .

    - name: Run tests in Docker container
      run: |
        docker run myapp:latest python -m unittest discover -s tests
>>>>>>> REPLACE
```

This workflow will trigger on every push and pull request to the `main` branch. It will build a Docker image from the Dockerfile in the root directory of the repository and then run the tests inside a container from that image.

.github/workflows/docker-build-and-test.yml

@@ -0,0 +1,25 @@
+name: Docker Build and Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v3
+
+    - name: Build Docker image
+      run: |
+        docker build -t myapp:latest .
+
+    - name: Run tests in Docker container
+      run: |
+        docker run myapp:latest python -m unittest discover -s tests