ci(release): build and release a nightly twice a day

- Remove other/nightly, the nightly channel uses the production files, so there are no longer two copies to keep in sync
- sync-cdn.sh --nightly syncs the files of the commit the nightly is built from to /coolify/nightly on the CDN, with the nightly version in its versions.json and in /coolify/release.json, and pushes them straight to main of coollabs-cdn
- version.sh picks the branch the nightly comes from, the release branch of the next version after the newest stable one or next, and names the version <preview>.<YYYYMMDD>.<N>
- The image is labeled with its version and commit, the nightly workflow reads both from the image nightly points at to count up N and to skip a run without a new commit

tests/Unit/UpgradeScriptContainerStartTest.php

@@ -46,18 +46,18 @@ it('reports an error when the new Coolify containers do not start', function (st
     expect($result['exitCode'])->toBe(1)
         ->and($result['status'])->toStartWith('error|')
         ->toContain('upgrade log');
-})->with(['scripts/upgrade.sh', 'other/nightly/upgrade.sh']);
+})->with(['scripts/upgrade.sh']);
 
 it('completes the upgrade when the coolify container runs but is not healthy within the wait timeout', function (string $script) {
     $result = runUpgradeScriptContainerStart($script, composeExitCode: 1, coolifyRunning: true);
 
     expect($result['exitCode'])->toBe(0)
         ->and($result['status'])->toBe('');
-})->with(['scripts/upgrade.sh', 'other/nightly/upgrade.sh']);
+})->with(['scripts/upgrade.sh']);
 
 it('completes the upgrade when docker compose up succeeds', function (string $script) {
     $result = runUpgradeScriptContainerStart($script, composeExitCode: 0, coolifyRunning: true);
 
     expect($result['exitCode'])->toBe(0)
         ->and($result['status'])->toBe('');
-})->with(['scripts/upgrade.sh', 'other/nightly/upgrade.sh']);
+})->with(['scripts/upgrade.sh']);