fix(images): install nodejs-corepack so corepack enable works

The fedora-43 nodejs rpm does not bundle corepack (unlike the upstream
Node.js distribution); it ships in a separate nodejs-corepack
subpackage. Without it the corepack/pnpm activation step failed with
'corepack: command not found' (exit 127).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

images/runner-fedora-43/Containerfile

@@ -12,12 +12,13 @@ RUN dnf install -y --setopt=install_weak_deps=False \
         git \
         jq \
         nodejs \
+        nodejs-corepack \
         npm \
         podman-remote \
         rsync \
     && dnf clean all
 
-# pnpm as a first-class peer of npm. corepack ships with nodejs.
+# pnpm as a first-class peer of npm, via corepack (nodejs-corepack rpm).
 RUN corepack enable && corepack prepare pnpm@latest --activate
 
 # Install act_runner binary.