Added pnpm (#6148)

* Added pnpm

* Removed cache for npm.

* Fixed.

* Added pnpm

* Fixed install script.

* Fixed windows script.

* Fixed.

* Fixed.

* Fixed install.

* Only install direct dependencies.

* Only install direct dependencies.

* Only install direct dependencies.

* Fixed windows build.

* fixed.

* fixed deploy.

* Fixed docker build.

* Fixed windows deploy

* Fixed docker build

* Fixed healthcheck.

* fixed.

* Fixed detection of live plugin managers dependencies.

* fixed.

* Remove Node 19 as it is not supported.

* Fixed.

* Fixed installDeps.sh

* Fixed.

* Fixed windows install.

* Fixed cypress path.

* Fixed.

* Run etherpad in background.

* Install cypress.

.github/workflows/lint-package-lock.yml

@@ -23,13 +23,6 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: 20
-          cache: 'npm'
-          cache-dependency-path: |
-            src/package-lock.json
-            src/bin/doc/package-lock.json
-      -
-        name: Install lockfile-lint
-        run: npm install --no-save lockfile-lint --legacy-peer-deps
       -
         name: Run lockfile-lint on package-lock.json
         run: >