refactor: rename containers as docker compositions, as they are

docker compositions/semaphoreui/docker-compose.postgres.yml

@@ -0,0 +1,42 @@
+---
+
+# Sources:
+# - https://github.com/semaphoreui/semaphore
+# - https://docs.semaphoreui.com/administration-guide/installation#docker
+
+services:
+  postgres:
+    restart: unless-stopped
+    image: postgres:16
+    hostname: postgres
+    volumes:
+      - semaphore-postgres:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: semaphore
+      POSTGRES_PASSWORD: semaphore
+      POSTGRES_DB: semaphore
+  semaphore:
+    depends_on:
+      - postgres
+    restart: unless-stopped
+    ports:
+      - 3000:3000
+    image: semaphoreui/semaphore:latest
+    environment:
+      TZ: Europe/Berlin
+      SEMAPHORE_DB_USER: semaphore
+      SEMAPHORE_DB_PASS: semaphore
+      SEMAPHORE_DB_HOST: postgres
+      SEMAPHORE_DB_PORT: 5432
+      SEMAPHORE_DB_DIALECT: postgres
+      SEMAPHORE_DB: semaphore
+      SEMAPHORE_PLAYBOOK_PATH: /tmp/semaphore/
+      SEMAPHORE_ADMIN_PASSWORD: changeme
+      SEMAPHORE_ADMIN_NAME: admin
+      SEMAPHORE_ADMIN_EMAIL: admin@localhost
+      SEMAPHORE_ADMIN: admin
+      SEMAPHORE_ACCESS_KEY_ENCRYPTION:  # generate with `head -c32 /dev/urandom | base64`
+    volumes:
+      - ./data/etc/semaphore:/etc/semaphore # config.json location
+volumes:
+  semaphore-postgres: