Bug 41362: Allow Cypress tests to use KOHA_USER and KOHA_PASS as override

The cypress.config.ts file had hardcoded API credentials (koha:koha)
which don't work in KTD environments that use different credentials.

This patch makes the config use KOHA_USER and KOHA_PASS environment
variables if set, falling back to koha:koha if not.

Test plan:
1. On a running KTD, run the cypress tests:
   $ ktd --shell
  k$ run_cypress
=> SUCCESS: Tests are run, no errors about credentials
2. Edit your KTD .env file, so KOHA_USER=tcohen, KOHA_PASS=tomasito
3. Shut your kTD down, and start a fresh one
4. Repeat 1
=> SUCCESS: The command shows `cypress run --env KOHA_USER=tcohen,KOHA_PASS=tomasito` is run.
=> FAIL: Some tests fail right away with invalid credentials error
5. Apply this patch
6. Repeat 1
=> SUCCESS: Same command as 4
=> SUCCESS: Tests don't fail for credentials
7. Sign off :-D

Signed-off-by: Tomás Cohen Arazi <tomascohen@theke.io>
Signed-off-by: David Nind <david@davidnind.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

cypress.config.ts

@@ -18,8 +18,8 @@ export default defineConfig({
         supportFile: "t/cypress/support/e2e.js",
         env: {
             opacBaseUrl: process.env.KOHA_OPAC_URL || "http://localhost:8080",
-            apiUsername: "koha",
-            apiPassword: "koha",
+            apiUsername: process.env.KOHA_USER || "koha",
+            apiPassword: process.env.KOHA_PASS || "koha",
         },
     },