chore: the SSH aliases and CI's runner label keep the servers' names

The servers' names are no secret, so the settings that carry them stay
as they were, and nothing on a server or a laptop needs changing: CI
runs on `sahaquiel` again, the release uploads to `ramiel-fdroid`, and
deploys by hand go through `sahaquiel-deploy`. Prose still names a
server by the domain it serves, which says what a reader needs.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

tool/fdroid_repo.sh

@@ -17,7 +17,7 @@
 # signed otherwise would make the F-Droid app refuse the repository. Its password
 # comes from $HALKYON_FDROID_KEYSTORE_PASSWORD, or is asked for; it's never
 # written down. Needs fdroidserver v2.4.5 (pipx), rsync, a JDK, the Android SDK,
-# and the ssh host fdroid-upload.
+# and the ssh host ramiel-fdroid.
 set -euo pipefail
 cd "$(git rev-parse --show-toplevel)"
 
@@ -25,7 +25,7 @@ readonly working="${HALKYON_FDROID_DIR:-$HOME/.local/share/halkyon-learn/fdroid}
 keystore="${HALKYON_FDROID_KEYSTORE:-$HOME/.local/share/halkyon-learn/fdroid-index.p12}"
 readonly key_alias='halkyon-fdroid'
 readonly pinned_file='tool/release/fdroid-index-certificate.sha256'
-readonly upload_host='fdroid-upload'
+readonly upload_host='ramiel-fdroid'
 readonly repo_url='https://halkyon.app/fdroid/repo'
 
 fail() {