Pinning support when installing plugins

[antoineauger]

Is your feature request related to a problem? Please describe. We are building our own Docker image to also bundle some etherpad plugins. After upgrading to etherpad-lite v2.0.0, we cannot pin plugin versions using the recommended install-plugins command:

FROM etherpad/etherpad:2.0.1
...
# this works but we would like to pin a specific version
RUN pnpm run install-plugins ep_headings2  

Describe the solution you'd like We would like to be able to specify a version/pin a plugin:

FROM etherpad/etherpad:2.0.1
...
RUN pnpm run install-plugins ep_headings2@0.2.61

Describe alternatives you've considered We can directly install the plugin with pnpm install but we would then miss any features/checks from the install-plugins command:

FROM etherpad/etherpad:2.0.1
...
RUN pnpm install -w ep_headings2@0.2.61

Additional context Before etherpad-lite v2.0.0, we were following these instructions and it worked quite well:

FROM etherpad/etherpad:1.9.6
...
RUN npm install --no-save --legacy-peer-deps ep_headings2@0.2.61

Plugin? N/A

/cc @fgreinacher

[antoineauger]

Thank you for implementing it so quickly @SamTV12345 🙏🏻 🚀

[SamTV12345]

You're welcome :)