fix: better layering in docker image

Dockerfile

@@ -52,9 +52,8 @@ RUN set -eo pipefail; \
     apt-get update; \
     apt-get install -y redis
 
-FROM system AS build
+FROM system AS next_prebuild
 
-RUN asdf reshim
 RUN npm i -g yarn
 RUN --mount=type=cache,target=/.yarn-cache \
     yarn config set cache-folder /.yarn-cache
@@ -63,11 +62,15 @@ COPY package.json turbo.json yarn.lock app.json ./
 COPY packages packages
 COPY web web
 COPY space space
-COPY apiserver apiserver
+
+RUN --mount=type=cache,target=/.yarn-cache \
+    yarn install
+
+FROM next_prebuild AS next_build
+
 RUN --mount=type=cache,target=/.yarn-cache \
     --mount=type=cache,target=/web/.next \
     --mount=type=cache,target=/space/.next \
-    yarn install && \
     yarn build && \
     cp -R /web/.next /web/_next && \
     cp -R /space/.next /space/_next
@@ -77,15 +80,17 @@ RUN mv /web/_next /web/.next && \
     cp -R /web/.next/standalone/web/* /web/ && \
     cp -R /space/.next/standalone/space/* /space/
 
+FROM next_build AS api_build
 ENV PYTHONDONTWRITEBYTECODE=1
 ENV PYTHONUNBUFFERED=1
 ENV PIP_DISABLE_PIP_VERSION_CHECK=1
 
+COPY apiserver apiserver
 RUN --mount=type=cache,target=/root/.cache/pip \
     cd /apiserver \
     && pip install -r requirements.txt --compile
 
-FROM build AS s6
+FROM api_build AS s6
 
 COPY docker/etc/ /etc/