httpd: Prefix the release tag message

- Write "httpd: Release <version>" so the tag matches the release commit
- Show the component in the radicle-artifact release title

explorer/crates/radicle-httpd/build/tag

@@ -25,7 +25,7 @@ rad auth
 
 case "$confirmation" in
   [Yy]*)
-    if git tag --annotate --sign "$tag" -m "Release $version" "$commit"; then
+    if git tag --annotate --sign "$tag" -m "httpd: Release $version" "$commit"; then
       echo "Tag $tag created and signed over $commit."
     else
       echo "Failed to create tag."