Only write plugins to json file in Dockerfile

Dockerfile

@@ -90,18 +90,8 @@ WORKDIR "${EP_DIR}"
 
 COPY --chown=etherpad:etherpad ./ ./
 
-# Plugins must be installed before installing Etherpad's dependencies, otherwise
+RUN { [ -z "${ETHERPAD_PLUGINS}" ] || /bin/bash -c 'ARR_PLUGINS=($ETHERPAD_PLUGINS) && jq -n "{plugins: \$ARGS.positional}" --args ${ARR_PLUGINS[@]} > var/installed_plugins.json'; } && \
-# npm will try to hoist common dependencies by removing them from
+    src/bin/installDeps.sh &&
-# src/node_modules and installing them in the top-level node_modules. As of
-# v6.14.10, npm's hoist logic appears to be buggy, because it sometimes removes
-# dependencies from src/node_modules but fails to add them to the top-level
-# node_modules. Even if npm correctly hoists the dependencies, the hoisting
-# seems to confuse tools such as `npm outdated`, `npm update`, and some ESLint
-# rules.
-RUN { [ -z "${ETHERPAD_PLUGINS}" ] || \
-      npm install --no-save --legacy-peer-deps ${ETHERPAD_PLUGINS}; } && \
-    src/bin/installDeps.sh && \
-    rm -rf ~/.npm
 
 # Copy the configuration file.
 COPY --chown=etherpad:etherpad ${SETTINGS} "${EP_DIR}"/settings.json

src/static/js/pluginfw/installer.js

@@ -65,7 +65,9 @@ exports.checkForMigration = async () => {
   const installedPlugins = JSON.parse(fileContent.toString());
 
   for (const plugin of installedPlugins.plugins) {
-    await exports.manager.install(plugin)
+    if (plugin.startsWith(plugins.prefix) && plugin !== 'ep_etherpad-lite') {
+      await exports.manager.install(plugin)
+    }
   }
 };