Add 'dis' component

This commit adds a new 'dis' component to the distillery that serves a
list of all known instances for the moment.

distillery/resources/compose/dis/Dockerfile

@@ -0,0 +1,5 @@
+FROM docker.io/library/alpine
+
+COPY wdcli /wdcli
+EXPOSE 8888
+CMD ["/wdcli","--internal-in-docker","--config","${CONFIG_PATH}","dis_server","--bind","0.0.0.0:8888"]

distillery/resources/compose/dis/docker-compose.yml

@@ -0,0 +1,28 @@
+version: "3.7"
+
+services:
+  wdresolve:
+    build: .
+    restart: always
+    environment:
+      # port and hostname for this image to use
+      VIRTUAL_HOST: ${VIRTUAL_HOST}
+      VIRTUAL_PORT: 8888
+      VIRTUAL_PATH: /dis/
+
+      CONFIG_PATH: ${CONFIG_PATH}
+      
+      # optional letsencrypt email
+      LETSENCRYPT_HOST: ${LETSENCRYPT_HOST}
+      LETSENCRYPT_EMAIL: ${LETSENCRYPT_EMAIL}
+
+    volumes:
+      - "${CONFIG_PATH}:${CONFIG_PATH}:ro"
+      - "${DEPLOY_ROOT}:${DEPLOY_ROOT}:ro"
+      - "${GLOBAL_AUTHORIZED_KEYS_FILE}:${GLOBAL_AUTHORIZED_KEYS_FILE}:ro"
+      - "${SELF_OVERRIDES_FILE}:${SELF_OVERRIDES_FILE}:ro"
+
+networks:
+  default:
+    name: distillery
+    external: true