Fix Ship release: site-root is project-relative, not CARGO_TARGET_DIR

cp was looking for the site bundle under $CARGO_TARGET_DIR/site, but
site-root = "target/site" in Cargo.toml is resolved relative to the
project directory regardless of CARGO_TARGET_DIR - only the plain
cargo build outputs (release/, front/) actually move when that's
overridden.

.gitea/workflows/deploy.yml

@@ -50,7 +50,10 @@ jobs:
           rel="/srv/app/uhhm-portal/releases/${{ github.sha }}"
           mkdir -p "$rel"
           cp "$CARGO_TARGET_DIR/release/portal" "$rel/uhhm-portal"
-          cp -r "$CARGO_TARGET_DIR/site" "$rel/site"
+          # site-root ("target/site" in Cargo.toml) is project-relative,
+          # not affected by CARGO_TARGET_DIR - only the plain `cargo build`
+          # outputs (release/, front/) move with that override.
+          cp -r target/site "$rel/site"
           ln -sfn "$rel" /srv/app/uhhm-portal/current
 
       # Sourced from this repo's own Settings -> Actions Variables/Secrets,