Update setup docs and setup script for Yarn 3

Signed-off-by: David Mehren <git@herrmehren.de>

bin/setup

@@ -14,19 +14,11 @@ if ! type yarn > /dev/null; then
   cat << EOF
 FATAL: Yarn could not be found.
 
-Please follow the official installation instructions at
+Run 'corepack enable', then try this script again.
-https://classic.yarnpkg.com/en/docs/install
+If 'corepack' is not available, try 'npm i -g corepack' first.
-and try again.
-EOF
-  exit 1
-fi
 
-if version_lt "$(yarn --version)" '1.22.0'; then
+For more information, see the installation instructions at
-  cat << EOF
+https://yarnpkg.com/getting-started/install
-FATAL: Your Yarn version is not supported.
-
-Please upgrade to version 1.22.0 or higher and try again.
-See https://classic.yarnpkg.com/en/docs/install for instructions.
 EOF
   exit 1
 fi
@@ -47,10 +39,10 @@ if [ ! -f config.json ]; then
 fi
 
 echo "Installing packages..."
-yarn install --production=true --frozen-lockfile
+yarn workspaces focus --production
 
 cat << EOF
-If you want to build the frontend yourself, you need to run 'yarn install --frozen-lockfile' before 'yarn build' to install the devDependencies for the build process.
+If you want to build the frontend yourself, you need to run 'yarn install --immutable' before 'yarn build' to install the devDependencies for the build process.
 
 Edit the following config file to setup HedgeDoc server and client.
 Read more info at https://docs.hedgedoc.org/configuration/

docs/content/setup/manual-setup.md

@@ -10,7 +10,9 @@
       This can break if symbols with more bytes are used.
       You can use `alter database <DBNAME> character set utf8mb4 COLLATE utf8mb4_unicode_ci` to be on the safe side.
     - NPM (and its dependencies, [node-gyp](https://github.com/nodejs/node-gyp#installation))
-    - [Yarn Classic](https://classic.yarnpkg.com) 1.22 or higher (Yarn 2 is currently not supported)
+    - [Yarn 3](https://yarnpkg.com/): Running `corepack enable` once should be sufficient, Node.js will then
+      automatically use the correct version of Yarn. If `corepack` is not available, try `npm i -g corepack` first.
+      See [the official docs](https://yarnpkg.com/getting-started/install) for more information and other options.
     - Bash (for the setup script)
     - For **building** the HedgeDoc frontend you need a machine with at least **2 GB** RAM.
       - Starting with release 1.7 the release tarball includes the prebuilt frontend, so building it yourself is not necessary.
@@ -35,7 +37,7 @@
    It's also possible to use environment variables.
    For details, have a look at [the configuration documentation](../configuration.md).
 5. *:octicons-light-bulb-16: If you use the release tarball for 1.7.0 or newer, this step can be skipped.*  
-   Build the frontend bundle by running `yarn install --frozen-lockfile` and then `yarn build`. The extra `yarn install --frozen-lockfile` is necessary as `bin/setup` does not install the build dependencies.
+   Build the frontend bundle by running `yarn install --immutable` and then `yarn build`. The extra `yarn install --immutable` is necessary as `bin/setup` does not install the build dependencies.
 6. It is recommended to start your server manually once:  
    ```shell
    NODE_ENV=production yarn start
@@ -62,7 +64,7 @@ If you want to upgrade HedgeDoc from an older version, follow these steps:
    <small>If you use Git, you can check out the new tag with e.g. `git fetch origin && git checkout 1.9.7`</small>
 5. Run `bin/setup`. This will take care of installing dependencies. It is safe to run on an existing installation.
 6. *:octicons-light-bulb-16: If you used the release tarball for 1.7.0 or newer, this step can be skipped.*  
-   Build the frontend bundle by running `yarn install --frozen-lockfile` and `yarn build`. The extra `yarn install --frozen-lockfile` is necessary as `bin/setup` does not install the       build dependencies.
+   Build the frontend bundle by running `yarn install --immutable` and `yarn build`. The extra `yarn install --immutable` is necessary as `bin/setup` does not install the       build dependencies.
 7. It is recommended to start your server manually once:
    ```shell
    NODE_ENV=production yarn start
@@ -102,7 +104,7 @@ Type=exec
 Environment=NODE_ENV=production
 Restart=always
 RestartSec=2s
-ExecStart=/usr/bin/yarn start --production
+ExecStart=/usr/bin/yarn start
 CapabilityBoundingSet=
 NoNewPrivileges=true
 PrivateDevices=true