Always bypass the apt cache for the Mina deb repos

`configure-apt-proxy.sh` derived its DIRECT bypass solely from `DEB_REPO`, the repo the current build pulls from. Builds pointed elsewhere — notably `DebianRepo.Local`, which renders to `http://localhost:8080` — therefore left `packages.o1test.net` routed through apt-cacher-ng. That host redirects http to https at the CDN, and apt-cacher-ng cannot follow a redirect to TLS for a cached remote, so the fetch came back as a fatal `500 Remote or cache error`.

The four Mina deb repo hosts are now bypassed unconditionally, alongside the existing carve-out for the Canonical archives. The `DEB_REPO`-derived bypass still applies to anything else, and is skipped when it duplicates one of the four.
