Move wisski instance code to separate package

internal/wisski/instances/barrel/docker-compose.yml

@@ -0,0 +1,33 @@
+version: "3.7"
+
+services:
+  barrel:
+    build: .
+    restart: always
+    hostname: ${VIRTUAL_HOST}.wisski
+
+    # label it with the current slug
+    labels:
+      - "eu.wiss-ki.barrel.slug=${SLUG}"
+      - "eu.wiss-ki.barrel.authfile=/var/www/.ssh/authorized_keys,/var/www/.ssh/global_authorized_keys"
+
+      - "traefik.enable=True"
+      - "eu.wiss-ki.barrel.distillery=${DOCKER_NETWORK_NAME}"
+
+      - "traefik.http.routers.wisski_${SLUG}.rule=Host(`${VIRTUAL_HOST}`)"
+      - "traefik.http.routers.wisski_${SLUG}.tls=${HTTPS_ENABLED}"
+      - "traefik.http.routers.wisski_${SLUG}.tls.certresolver=distillery"
+      - "traefik.http.services.wisski_${SLUG}.loadbalancer.server.port=8080"
+    
+    # volumes that are mounted
+    volumes:
+      - ${GLOBAL_AUTHORIZED_KEYS_FILE}:/var/www/.ssh/global_authorized_keys:ro
+      - ${DATA_PATH}/.composer:/var/www/.composer
+      - ${DATA_PATH}/data:/var/www/data
+      - ${DATA_PATH}/authorized_keys:/var/www/.ssh/authorized_keys
+      - ${RUNTIME_DIR}:/runtime:ro
+
+networks:
+  default:
+    name: ${DOCKER_NETWORK_NAME}
+    external: true