implemented compose by url, parse, local yaml.

roles/alloy/upstream/SOURCE.md

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+# Upstream Snapshot
+
+This directory stores copied upstream reference files for the `alloy` role.
+
+See `docs/upstream-sources.yml` for repository URLs, refs, README paths, Compose paths, and verification status.
+
+Snapshot files are reference material only. Deployments are generated from this role's `templates/` directory.

roles/alloy/upstream/docker-compose.yml

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+services:
+  grafana-alloy:
+    image: grafana/alloy:latest
+    container_name: grafana-alloy
+    ports:
+      - '12345:12345'
+    volumes:
+      # mount config file
+      - './grafana/alloy/config.alloy:/etc/alloy/config.alloy'
+      # give access to running docker containers for discovery.docker
+      - /var/run/docker.sock:/var/run/docker.sock
+      # give access to docker's log files directory (optional)
+      - /var/lib/docker/containers:/var/lib/docker/containers:ro
+    environment:
+      # pass environment variables for config.alloy
+      GRAFANA_LOKI_URL: ${GRAFANA_LOKI_URL}
+      GRAFANA_LOKI_USERNAME: ${GRAFANA_LOKI_USERNAME}
+#      GRAFANA_CLOUD_API_KEY: ${GRAFANA_CLOUD_API_KEY}
+    command:
+      - run
+      - --server.http.listen-addr=0.0.0.0:12345
+      - --storage.path=/var/lib/alloy/data
+      - /etc/alloy/config.alloy