ci: fix host-mode docker go invocation

.forgejo/workflows/ci.yml

@@ -1,4 +1,3 @@
-# Host-mode runner: no local Go — use official golang image + docker.sock.
 name: CI
 
 on:
@@ -22,19 +21,12 @@ jobs:
         run: |
           set -euo pipefail
           case "$GITHUB_WORKSPACE" in
-            /data/*) HOST_WORKSPACE="/opt/forgejo-runner/data${GITHUB_WORKSPACE#/data}" ;;
-            *) HOST_WORKSPACE="$GITHUB_WORKSPACE" ;;
+            /data/*) HOST_WS="/opt/forgejo-runner/data${GITHUB_WORKSPACE#/data}" ;;
+            *) HOST_WS="$GITHUB_WORKSPACE" ;;
           esac
           test -f "$GITHUB_WORKSPACE/go.mod"
+          # Single -c string so host-mode act does not split the docker command.
           docker run --rm --network host \
-            --volume "$HOST_WORKSPACE:/src" \
-            --workdir /src \
-            -e CGO_ENABLED=0 \
+            -v "${HOST_WS}:/src" -w /src -e CGO_ENABLED=0 \
             golang:1.25-bookworm \
-            bash -lc '
-              set -euo pipefail
-              go version
-              go test ./...
-              make build
-              ls -la dist/
-            '
+            sh -c "go version && go test ./... && make build && ls -la dist/"