Refactor Package structure

This commit cleans up the package structure, to make two new top-level
packages `internal` (for internal-use packages) and `pkg` (for general
shared utility code).

internal/component/ssh/ssh.go

@@ -0,0 +1,25 @@
+package ssh
+
+import (
+	"embed"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/component"
+)
+
+type SSH struct {
+	component.ComponentBase
+}
+
+func (SSH) Name() string {
+	return "ssh"
+}
+
+//go:embed all:stack
+var resources embed.FS
+
+func (ssh SSH) Stack() component.Installable {
+	return ssh.ComponentBase.MakeStack(component.Installable{
+		Resources:   resources,
+		ContextPath: "stack",
+	})
+}

internal/component/ssh/stack/docker-compose.yml

@@ -0,0 +1,17 @@
+version: "3.7"
+
+services:
+    ssh:
+        image: ghcr.io/tkw1536/dockersshd:latest
+        command: -hostkey /keys/hostkey -shell /user_shell.sh -keylabel eu.wiss-ki.barrel.authfile -userlabel eu.wiss-ki.barrel.slug -L triplestore:7200 -L phpmyadmin:80 -L sql:3306
+        ports:
+            - "2222:2222"
+        volumes:
+            - './data/keys:/keys'
+            - '/var/run/docker.sock:/var/run/docker.sock:ro'
+        restart: always
+
+networks:
+    default:
+        name: distillery
+        external: true