Stop recompiling assets to enable relative url

As a result, an Internet connection is no longer required
to use relative URLs.

To enable relative url, we execute `gitlab:assets:compile`.
This have been removed in official documentation in v10.0.0
(first committed to gitlab-foss, then ported to gitlab(-ee))
- EE: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/1139/
- CE: https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/8831

An internet connection was required when enabling relative urls
to install the node modules required for compilation.
I reviewed the rake task `gitlab:assets:compile` and investigated
whether it was necessary to compile all assets
just because the relative url changed,
and found that this rake task is internally a separate rake task
`gitlab:assets :fix_urls` which rewrite the reference URL in the css.

I removed rake task `gitlab:assets:compile` at runtime
and confirmed that the gitlab application worked normally as before.
I have confirmed that at least the following functions work properly.
- Administrator password reset at first login
- Create empty project
- Edit/add and commit files using web IDE
- Create merge request/issue
- Attach files to comments
- Create empty group
- Move existing project to group

In addition, we no longer need to do following things
- persist node_modules, recompiled assets and caches
- apply patches to gitlab itself to avoid removing (symlink to) node_modules/

This change also reduces startup time in certain cases
when the relative URL feature is enabled
(when assets are compiled; for example,
when performing a version upgrade or changing the relative URL)
(on my environment, `gitlab:assets:fix_urls` took about 20 seconds)

Dockerfile

@@ -84,7 +84,7 @@ LABEL \
 
 EXPOSE 22/tcp 80/tcp 443/tcp
 
-VOLUME ["${GITLAB_DATA_DIR}", "${GITLAB_LOG_DIR}","${GITLAB_HOME}/gitlab/node_modules"]
+VOLUME ["${GITLAB_DATA_DIR}", "${GITLAB_LOG_DIR}"]
 WORKDIR ${GITLAB_INSTALL_DIR}
 ENTRYPOINT ["/sbin/entrypoint.sh"]
 CMD ["app:start"]

assets/runtime/functions

@@ -1756,25 +1756,6 @@ initialize_datadir() {
   chmod 700 ${GITLAB_DATA_DIR}/.ssh
   chmod 600 ${GITLAB_DATA_DIR}/.ssh/authorized_keys
   chown -R ${GITLAB_USER}: ${GITLAB_DATA_DIR}/.ssh
-
-  # recompile and persist assets when relative_url is in use
-  if [[ -n ${GITLAB_RELATIVE_URL_ROOT} ]]; then
-    mkdir -p ${GITLAB_TEMP_DIR}/cache
-    chmod 755 ${GITLAB_TEMP_DIR}/cache
-    chown ${GITLAB_USER}: ${GITLAB_TEMP_DIR}/cache
-
-    mkdir -p ${GITLAB_TEMP_DIR}/assets
-    chmod 755 ${GITLAB_TEMP_DIR}/assets
-    chown ${GITLAB_USER}: ${GITLAB_TEMP_DIR}/assets
-
-    # symlink ${GITLAB_INSTALL_DIR}/tmp/cache -> ${GITLAB_TEMP_DIR}/cache
-    rm -rf ${GITLAB_INSTALL_DIR}/tmp/cache
-    exec_as_git ln -s ${GITLAB_TEMP_DIR}/cache ${GITLAB_INSTALL_DIR}/tmp/cache
-
-    # symlink ${GITLAB_INSTALL_DIR}/public/assets -> ${GITLAB_TEMP_DIR}/assets
-    rm -rf ${GITLAB_INSTALL_DIR}/public/assets
-    exec_as_git ln -s ${GITLAB_TEMP_DIR}/assets ${GITLAB_INSTALL_DIR}/public/assets
-  fi
 }
 
 sanitize_datadir() {
@@ -2250,19 +2231,6 @@ migrate_database() {
   # clear cache if relative_url has changed.
   [[ -f ${GITLAB_TEMP_DIR}/GITLAB_RELATIVE_URL_ROOT ]] && CACHE_GITLAB_RELATIVE_URL_ROOT=$(cat ${GITLAB_TEMP_DIR}/GITLAB_RELATIVE_URL_ROOT)
   if [[ ! -f ${GITLAB_TEMP_DIR}/GITLAB_RELATIVE_URL_ROOT || ${GITLAB_RELATIVE_URL_ROOT} != ${CACHE_GITLAB_RELATIVE_URL_ROOT} ]]; then
-    # assets need to be recompiled when GITLAB_RELATIVE_URL_ROOT is used
-    if [[ -n ${GITLAB_RELATIVE_URL_ROOT} ]]; then
-      if [[ ! -d ${GITLAB_HOME}/gitlab/node_modules ]]; then
-        mkdir -p ${GITLAB_HOME}/gitlab/node_modules
-        chown -R ${GITLAB_USER}: ${GITLAB_HOME}/gitlab/node_modules
-      fi
-      echo "Prepare recompile assets... Installing missing node_modules for assets"
-      chown -R ${GITLAB_USER}: ${GITLAB_HOME}/gitlab/node_modules
-      exec_as_git yarn install --production --pure-lockfile
-      echo "Recompiling assets (relative_url in use), this could take a while..."
-      exec_as_git bundle exec rake gitlab:assets:compile NODE_OPTIONS="--max-old-space-size=8192" >/dev/null 2>&1
-    fi
-
     echo "Clearing cache..."
     exec_as_git bundle exec rake cache:clear >/dev/null 2>&1
     echo "${GITLAB_RELATIVE_URL_ROOT}" > ${GITLAB_TEMP_DIR}/GITLAB_RELATIVE_URL_ROOT