Add an experimental Alpine image flow

Stage a complete Alpine x86_64 image stack so \	--image alpineworks like the existing manual Void path instead of relying on Debian-oriented image builds.\n\nAdd make targets plus kernel/rootfs/register helpers that download pinned Alpine artifacts, extract a Firecracker-compatible vmlinux, build a matching mkinitfs initramfs, seed OpenRC services, and register/promote a managed image named alpine.\n\nFold in the bring-up fixes discovered during boot validation: use rootfstype=ext4 in shared boot args, install libgcc/libstdc++ for the opencode binary, and give opencode more time to become ready on cold boots.\n\nValidate with go test ./..., the Alpine helper builds, image promotion, and banger vm create --image alpine --name alp --nat plus guest service and port checks.

internal/cli/banger.go

@@ -175,9 +175,9 @@ func newInternalVSockAgentPathCommand() *cobra.Command {
 func newInternalPackagesCommand() *cobra.Command {
 	var docker bool
 	cmd := &cobra.Command{
-		Use:    "packages <debian|void>",
+		Use:    "packages <debian|void|alpine>",
 		Hidden: true,
-		Args:   exactArgsUsage(1, "usage: banger internal packages <debian|void> [--docker]"),
+		Args:   exactArgsUsage(1, "usage: banger internal packages <debian|void|alpine> [--docker]"),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			var packages []string
 			switch strings.TrimSpace(args[0]) {
@@ -188,6 +188,8 @@ func newInternalPackagesCommand() *cobra.Command {
 				}
 			case "void":
 				packages = imagepreset.VoidBasePackages()
+			case "alpine":
+				packages = imagepreset.AlpineBasePackages()
 			default:
 				return fmt.Errorf("unknown package preset %q", args[0])
 			}

internal/cli/cli_test.go

@@ -111,6 +111,24 @@ func TestInternalNATFlagsExist(t *testing.T) {
 	}
 }
 
+func TestInternalPackagesCommandSupportsAlpine(t *testing.T) {
+	cmd := NewBangerCommand()
+	var stdout bytes.Buffer
+	cmd.SetOut(&stdout)
+	cmd.SetArgs([]string{"internal", "packages", "alpine"})
+
+	if err := cmd.Execute(); err != nil {
+		t.Fatalf("Execute(): %v", err)
+	}
+
+	output := stdout.String()
+	for _, want := range []string{"alpine-base", "docker", "libgcc", "libstdc++", "mkinitfs", "openssh"} {
+		if !strings.Contains(output, want+"\n") {
+			t.Fatalf("output = %q, want package %q", output, want)
+		}
+	}
+}
+
 func TestVMCreateFlagsExist(t *testing.T) {
 	root := NewBangerCommand()
 	vm, _, err := root.Find([]string{"vm"})

internal/imagepreset/preset.go

@@ -43,6 +43,31 @@ var voidBase = []string{
 	"wget",
 }
 
+var alpineBase = []string{
+	"alpine-base",
+	"bash",
+	"ca-certificates",
+	"curl",
+	"docker",
+	"docker-cli-compose",
+	"e2fsprogs",
+	"git",
+	"iproute2",
+	"less",
+	"libgcc",
+	"libstdc++",
+	"make",
+	"mkinitfs",
+	"openssh",
+	"procps-ng",
+	"shadow",
+	"sudo",
+	"tmux",
+	"tree",
+	"vim",
+	"wget",
+}
+
 func DebianBasePackages() []string {
 	return append([]string(nil), debianBase...)
 }
@@ -51,6 +76,10 @@ func VoidBasePackages() []string {
 	return append([]string(nil), voidBase...)
 }
 
+func AlpineBasePackages() []string {
+	return append([]string(nil), alpineBase...)
+}
+
 func Hash(lines []string) string {
 	sum := sha256.Sum256([]byte(strings.Join(lines, "\n") + "\n"))
 	return fmt.Sprintf("%x", sum)

internal/opencode/opencode.go

@@ -17,7 +17,7 @@ const (
 	ShimPath         = "/root/.local/share/mise/shims/opencode"
 	ServiceName      = "banger-opencode.service"
 	RunitServiceName = "banger-opencode"
-	ReadyTimeout     = 15 * time.Second
+	ReadyTimeout     = 45 * time.Second
 	pollInterval     = 200 * time.Millisecond
 )
 

internal/system/system.go

@@ -417,7 +417,7 @@ func UpdateFSTab(existing string) string {
 
 func BuildBootArgs(vmName, guestIP, bridgeIP, dns string) string {
 	return fmt.Sprintf(
-		"console=ttyS0 reboot=k panic=1 pci=off root=/dev/vda rw ip=%s::%s:255.255.255.0:%s:eth0:off:%s hostname=%s systemd.mask=home.mount systemd.mask=var.mount",
+		"console=ttyS0 reboot=k panic=1 pci=off root=/dev/vda rootfstype=ext4 rw ip=%s::%s:255.255.255.0:%s:eth0:off:%s hostname=%s systemd.mask=home.mount systemd.mask=var.mount",
 		guestIP,
 		bridgeIP,
 		vmName,

internal/system/system_test.go

@@ -171,7 +171,7 @@ func TestBuildBootArgsIncludesHostnameInIPField(t *testing.T) {
 	t.Parallel()
 
 	got := BuildBootArgs("devbox", "172.16.0.2", "172.16.0.1", "1.1.1.1")
-	want := "console=ttyS0 reboot=k panic=1 pci=off root=/dev/vda rw ip=172.16.0.2::172.16.0.1:255.255.255.0:devbox:eth0:off:1.1.1.1 hostname=devbox systemd.mask=home.mount systemd.mask=var.mount"
+	want := "console=ttyS0 reboot=k panic=1 pci=off root=/dev/vda rootfstype=ext4 rw ip=172.16.0.2::172.16.0.1:255.255.255.0:devbox:eth0:off:1.1.1.1 hostname=devbox systemd.mask=home.mount systemd.mask=var.mount"
 	if got != want {
 		t.Fatalf("BuildBootArgs() = %q, want %q", got, want)
 	}