worker: bake dotfiles pi config (filtered) + shared lvmh-pi-cache volume; CopyToContainer seeding

daemon/docker.go

@@ -41,6 +41,8 @@ const (
 	labelSession     string = "lvmh.session"
 	volumeRepoPrefix string = "lvmh-repo-"
 	volumeSessions   string = "lvmh-sessions"
+	volumePiCache    string = "lvmh-pi-cache" // pi package cache (git:/npm:), shared across spawns
+	cacheMount       string = "/root/.pi/agent/cache"
 	workspaceMount   string = "/workspace"
 	sessionsMount    string = "/pi-sessions"
 
@@ -382,8 +384,15 @@ func (s *Spawner) createAndStart(ctx context.Context, repo, slug, sessionID stri
 	if _, err := s.cli.VolumeCreate(ctx, volume.CreateOptions{Name: volumeSessions}); err != nil {
 		return "", fmt.Errorf("volume %s: %w", volumeSessions, err)
 	}
+	if _, err := s.cli.VolumeCreate(ctx, volume.CreateOptions{Name: volumePiCache}); err != nil {
+		return "", fmt.Errorf("volume %s: %w", volumePiCache, err)
+	}
 
-	binds := []string{repoVolume + ":" + workspaceMount, volumeSessions + ":" + sessionsMount}
+	binds := []string{
+		repoVolume + ":" + workspaceMount,
+		volumeSessions + ":" + sessionsMount,
+		volumePiCache + ":" + cacheMount,
+	}
 	cfg := &container.Config{
 		Image: imageRefWorker,
 		Env: []string{

daemon/spawner_test.go

@@ -77,9 +77,10 @@ func TestSpawnerStartHappyPath(t *testing.T) {
 	wantBinds := []string{
 		"lvmh-repo-group-project:" + workspaceMount,
 		volumeSessions + ":" + sessionsMount,
+		volumePiCache + ":" + cacheMount,
 	}
-	if len(c.HostConfig.Binds) != 2 {
-		t.Fatalf("binds = %v, want %v (no models file)", c.HostConfig.Binds, wantBinds)
+	if len(c.HostConfig.Binds) != 3 {
+		t.Fatalf("binds = %v, want %v", c.HostConfig.Binds, wantBinds)
 	}
 	for i, b := range wantBinds {
 		if c.HostConfig.Binds[i] != b {