Add test setup

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• [x] one integration test/headless test for HTML head metadata
• [x] one headless test for map
• [x] tests run locally with Cypress
• [x] tests run as GitHub action

Useful resources to check out:

• https://docs.pkp.sfu.ca/dev/testing/en/plugins-themes
• https://github.com/pkp/ojs/blob/ef6facfcdc9b86a58bc3c788522f3b8d76730198/cypress/tests/data/20-CreateContext.spec.js#L70
• https://github.com/pkp/ojs/tree/main/cypress/tests/data/60-content (for submissions/content creation)
• useful functions for tests: https://github.com/pkp/pkp-lib/blob/main/cypress/support/commands.js
• https://github.com/RBoelter/twitterBlock/blob/stable-3_2_1/.github/workflows/twitter_ci_tests.yml
• https://github.com/o2r-project/ojs-erc-plugin/tree/master/test

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I created a configuration based on the configuration file https://github.com/RBoelter/twitterBlock/blob/stable-3_2_1/.github/workflows/twitter_ci_tests.yml

Trying to get to run the project for OJS 3.3.x (the example uses only 3.2.1), and to get it to run locally with act, both failed. Issues were fore example a missing cypress installation (extra installation step did not remedy the issue)

Run cd ~/ojs
sh: 1: cypress: not found
Error: Process completed with exit code 127.

or that a connection to the database was not possible, maybe because of 127.0.0.1 != localhost and name resolving issues with the used containers.

The confirugation is preserved as the file integration_test_yml.

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Test setup works on my fork:

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Map testing: https://medium.com/geoman-blog/testing-maps-e2e-with-cypress-ba9e5d903b2b

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Map testing: https://medium.com/geoman-blog/testing-maps-e2e-with-cypress-ba9e5d903b2b

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