Work around the corepack key bug in the Devcontainer, where MS hasn't updated the node-22 version yet.

Author: jyasskin

.devcontainer/Dockerfile

@@ -7,7 +7,7 @@ ENV PATH=/home/node/depot_tools:${PNPM_HOME}:${FLYCTL_INSTALL}/bin:${PATH}
 RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     && apt-get -y install --no-install-recommends bash-completion postgresql-client-15
 
-RUN su node -c "npm remove -g pnpm" && corepack enable
+RUN su node -c "npm remove -g pnpm" && su node -c "npm install -g corepack" && corepack enable
 
 RUN su node -c "pnpm install -g playwright && playwright install-deps"