Move code into new component package

This commit cleans up the resources in the 'embed' package, and instead
moves them into subpackages of a new 'compose' package. This makes sure
that '.env' templates and docker compose contexts are located in the
same location.

embed/resources/compose/ssh/docker-compose.yml

@@ -1,17 +0,0 @@
-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