ci: added docker compose config for running tests

[Markus92]

This PR adds a Dockerfile and docker-compose setup for running the test suite. It's based on the github actions workflow.

The standard setup is quite difficult to run - I never managed to install it successfully. So this way it should be easier to test the harvester extension.

Summary by Sourcery

Introduce Docker Compose setup for running tests, including a Dockerfile and configuration for services like Solr, Postgres, and Redis. Update documentation to guide users on using Docker Compose for testing.

CI:

• Add Docker Compose configuration for running tests, simplifying the test setup process.

Documentation:

• Update README.md to include instructions for running tests using Docker Compose.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds Docker Compose configuration for running tests, making it easier to set up and test the harvester extension. The changes include adding a Dockerfile and docker-compose.yml file, updating the README with new test instructions, and adding a shell script for running tests within the Docker environment.

File-Level Changes

Files	Changes
docker-compose.yml	Added a docker-compose.yml file to set up the testing environment with Solr, PostgreSQL, Redis, and a CKAN test container
ckanext/fairdatapoint/tests/run_tests.sh	Added a shell script to initialize the database, run tests, and generate a coverage report within the Docker environment
README.md	Updated the README.md file with new instructions for running tests using Docker Compose
README.md	Removed empty lines and made minor formatting adjustments throughout the README

---

Tips

• Trigger a new Sourcery review by commenting @sourcery-ai review on the pull request.
• Continue your discussion with Sourcery by replying directly to review comments.
• You can change your review settings at any time by accessing your dashboard:
  • Enable or disable the Sourcery-generated pull request summary or reviewer's guide;
  • Change the review language;
• You can always contact us if you have any questions or feedback.

[sourcery-ai]

Hey @Markus92 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟡 Security: 1 issue found
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 2 issues found

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment to tell me if it was helpful.}

[sourcery-ai]

🚨 suggestion (security): Consider using environment variables or Docker secrets for sensitive information

Hardcoding passwords in the Docker Compose file poses a security risk, especially if this file is committed to version control. Use environment variables or Docker secrets to manage sensitive information more securely.

      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}

[sourcery-ai]

suggestion (documentation): Updated test instructions with specific command

Consider keeping the link to the GDI harvester test information as well for more detailed guidance.

Suggested change

	To run the tests, run `docker compose build && docker-compose -f docker-compose.yml up --abort-on-container-exit --exit-code-from ckan-test && docker-compose rm -fsv`
	To run the tests:
	1. Run the following command:
	`docker compose build && docker-compose -f docker-compose.yml up --abort-on-container-exit --exit-code-from ckan-test && docker-compose rm -fsv`
	2. For more detailed guidance on GDI harvester testing, refer to [GDI Harvester Test Information](link-to-gdi-harvester-test-info).

[sourcery-ai]

question (documentation): Changed formatting of config settings comments

Is this change in indentation intentional? It might affect readability.

[brunopacheco1]

important: can you please check these changes, they may conflict with dcat-ap 3 support and ckanext-dcat 2.0.