Update plainui to yarn 4.5.1

Dockerfile

@@ -43,6 +43,7 @@ RUN --mount=target=/var/lib/apt/lists/,type=cache,sharing=locked \
     apt-get install \
         build-essential \
         yarnpkg && \
+    /usr/bin/yarnpkg global bin corepack enable &&\
     mkdir /install
 
 WORKDIR /install
@@ -64,14 +65,14 @@ FROM build as build-static
 
 # Only copy over the requirements files, use cache if they have not changed.
 RUN mkdir -p /app/plainui/
-COPY src/plainui/package.json src/plainui/yarn.lock /app/plainui/
-
-WORKDIR /app/plainui
-RUN /usr/bin/yarnpkg
+RUN /usr/bin/yarnpkg global bin corepack enable
 
 COPY src/ /app/
 
-RUN /usr/bin/yarnpkg build
+WORKDIR /app/plainui
+RUN /usr/bin/yarnpkg set version stable &&\
+    /usr/bin/yarnpkg install &&\
+    /usr/bin/yarnpkg build
 WORKDIR /app
 RUN export DJANGO_SETTINGS_MODULE='hub.settings.build' && \
     python3 /app/manage.py collectstatic --noinput && \
@@ -113,7 +114,8 @@ RUN --mount=target=/var/lib/apt/lists/,type=cache,sharing=locked \
     --mount=target=/var/cache/apt/archives/,type=cache,sharing=locked \
     if [ "$DEVELOPMENT" = "True" ]; then\
         apt-get install \
-            yarnpkg; \
+            yarnpkg &&\
+        /usr/bin/yarnpkg global bin corepack enable;\
     fi &&\
     useradd -u $DOCKER_UID -ms /bin/bash -d /app_home appuser
 

src/plainui/.gitignore

@@ -42,3 +42,13 @@ jspm_packages/
 
 # Mac OSX
 .DS_Store
+
+# yarn
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+# SDKS are excluded as we do not want them in the repository
+# !.yarn/sdks
+!.yarn/versions

src/plainui/.yarnrc.yml

+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-4.5.1.cjs

src/plainui/package.json

@@ -18,5 +18,6 @@
   "scripts": {
     "build": "sass --silence-deprecation slash-div,mixed-decls,color-functions,global-builtin,import -I node_modules --style=compressed styles/hub.scss:static/plainui/hub.css",
     "watch": "sass --watch -I node_modules styles:static/plainui"
-  }
+  },
+  "packageManager": "yarn@4.5.1"
 }