Follow tests closely

Dockerfile

@@ -20,16 +20,17 @@ COPY . .
 
 # Install yarn so it will be available read-only
 # https://github.com/nodejs/corepack/issues/183#issue-1379672431
+# https://github.com/nodejs/corepack/blob/bc13d40037d0b1bfd386e260ae741f55505b5c7c/tests/main.test.ts#L483
 ENV COREPACK_HOME=/tmp/corepack
 
 RUN set -ex; \
-  corepack enable yarn; \
-  corepack pack -o ./corepack.tgz; \
-  COREPACK_ENABLE_NETWORK=0 corepack install -g ./corepack.tgz;
+  corepack enable yarn;
+  # corepack pack -o ./corepack.tgz; \
+  # COREPACK_ENABLE_NETWORK=0 corepack install -g ./corepack.tgz;
 
 # https://github.com/nodejs/corepack/pull/446#issue-2218976611
+RUN corepack install yarn
 RUN corepack yarn --version
-RUN COREPACK_ENABLE_NETWORK=0 yarn --version
 # https://github.com/nodejs/corepack/issues/414#issuecomment-2096218732
 RUN chmod 444 /tmp/corepack/lastKnownGood.json
 RUN chmod 555 /tmp/corepack
@@ -58,4 +59,7 @@ ENV YARN_ENABLE_HARDENED_MODE=0
 # Because I cry myself to sleep
 ENV DEBUG=*
 
+# Let's check to be certain
+RUN yarn --version
+
 ENTRYPOINT [ "/opt/test-runner/bin/run.sh" ]