chg: [etherpad] update docs for 0k modules image building

etherpad/README.org

@@ -13,13 +13,21 @@ Used:
 #+begin_src sh
 TAG=1.8.14
 git clone https://github.com/ether/etherpad-lite --depth 1 -b $TAG
-docker build --build-arg INSTALL_SOFFICE=1 . -t docker.0k.io/etherpad:${TAG}-soffice
-docker push docker.0k.io/etherpad:${TAG}-soffice
+docker build --build-arg INSTALL_SOFFICE=1 \
+             --build-arg ETHERPAD_PLUGINS=" \
+            ep_font_family ep_mammoth ep_comments_page ep_table_of_contents \
+            ep_markdown ep_image_upload ep_spellcheck ep_headings2 ep_align \
+            ep_who_did_what ep_what_have_i_missed ep_embedmedia \
+            ep_openid_connect ep_rss ep_git_commit_saved_revision" \
+       . -t docker.0k.io/etherpad:${TAG}-0k
+docker push docker.0k.io/etherpad:${TAG}-0k
 #+end_src
 
+
 * Admin password
 
 We choose to NOT include admin panel as it allows to change settings
 and install plugins but this will not allow to reproduce an install
 easily. We can do this on the =compose.yml= side in a reproducible
 manner.
+