Do a large chunk of the move to go

This commit moves a huge chunk of the code to go. The TODO.md document
indicates what is left to be done.

env/stack_ssh.go

@@ -0,0 +1,16 @@
+package env
+
+import "github.com/FAU-CDI/wisski-distillery/internal/stack"
+
+func (dis *Distillery) SSHStack() stack.Installable {
+	// TODO: Ensure that .env is copied if needed
+	return dis.asCoreStack(stack.Installable{
+		Stack: stack.Stack{
+			Name: "sql",
+		},
+	})
+}
+
+func (dis *Distillery) SSHStackPath() string {
+	return dis.SSHStack().Dir
+}