Factor out shared environment variables in docker-compose.yml (#7016)

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I brought CVAT up using Docker Compose, and checked that the environment
variables in containers were as expected.

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docker-compose.yml

@@ -2,6 +2,15 @@
 #
 # SPDX-License-Identifier: MIT
 
+x-backend-env: &backend-env
+  CLICKHOUSE_HOST: clickhouse
+  CVAT_POSTGRES_HOST: cvat_db
+  CVAT_REDIS_HOST: cvat_redis
+  DJANGO_LOG_SERVER_HOST: vector
+  DJANGO_LOG_SERVER_PORT: 80
+  no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
+  SMOKESCREEN_OPTS: ${SMOKESCREEN_OPTS:-}
+
 services:
   cvat_db:
     container_name: cvat_db
@@ -41,20 +50,14 @@ services:
       - cvat_db
       - cvat_opa
     environment:
+      <<: *backend-env
       DJANGO_MODWSGI_EXTRA_ARGS: ''
       ALLOWED_HOSTS: '*'
-      CVAT_REDIS_HOST: 'cvat_redis'
-      CVAT_POSTGRES_HOST: 'cvat_db'
       ADAPTIVE_AUTO_ANNOTATION: 'false'
       IAM_OPA_BUNDLE: '1'
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
       NUMPROCS: 2
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      CLICKHOUSE_HOST: clickhouse
       CVAT_ANALYTICS: 1
       CVAT_BASE_URL:
-      SMOKESCREEN_OPTS: ${SMOKESCREEN_OPTS:-}
     command: init run server
     labels:
       - traefik.enable=true
@@ -80,13 +83,8 @@ services:
       - cvat_db
       - cvat_opa
     environment:
-      CVAT_REDIS_HOST: 'cvat_redis'
+      <<: *backend-env
       CVAT_REDIS_PASSWORD: ''
-      CVAT_POSTGRES_HOST: 'cvat_db'
-      CLICKHOUSE_HOST: clickhouse
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
       NUMPROCS: 1
     command: run utils
     volumes:
@@ -104,13 +102,8 @@ services:
       - cvat_redis
       - cvat_db
     environment:
-      CVAT_REDIS_HOST: 'cvat_redis'
-      CVAT_POSTGRES_HOST: 'cvat_db'
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
+      <<: *backend-env
       NUMPROCS: 2
-      SMOKESCREEN_OPTS: ${SMOKESCREEN_OPTS:-}
     command: run worker.import
     volumes:
       - cvat_data:/home/django/data
@@ -127,12 +120,7 @@ services:
       - cvat_redis
       - cvat_db
     environment:
-      CVAT_REDIS_HOST: 'cvat_redis'
-      CVAT_POSTGRES_HOST: 'cvat_db'
-      CLICKHOUSE_HOST: clickhouse
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
+      <<: *backend-env
       NUMPROCS: 2
     command: run worker.export
     volumes:
@@ -151,11 +139,7 @@ services:
       - cvat_db
       - cvat_opa
     environment:
-      CVAT_REDIS_HOST: 'cvat_redis'
-      CVAT_POSTGRES_HOST: 'cvat_db'
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
+      <<: *backend-env
       NUMPROCS: 1
     command: run worker.annotation
     volumes:
@@ -174,13 +158,8 @@ services:
       - cvat_db
       - cvat_opa
     environment:
-      CVAT_REDIS_HOST: 'cvat_redis'
-      CVAT_POSTGRES_HOST: 'cvat_db'
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
+      <<: *backend-env
       NUMPROCS: 1
-      SMOKESCREEN_OPTS: ${SMOKESCREEN_OPTS:-}
     command: run worker.webhooks
     volumes:
       - cvat_data:/home/django/data
@@ -197,11 +176,7 @@ services:
       - cvat_redis
       - cvat_db
     environment:
-      CVAT_REDIS_HOST: 'cvat_redis'
-      CVAT_POSTGRES_HOST: 'cvat_db'
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
+      <<: *backend-env
       NUMPROCS: 1
     command: run worker.quality_reports
     volumes:
@@ -219,12 +194,7 @@ services:
       - cvat_redis
       - cvat_db
     environment:
-      CVAT_REDIS_HOST: 'cvat_redis'
-      CVAT_POSTGRES_HOST: 'cvat_db'
-      DJANGO_LOG_SERVER_HOST: vector
-      DJANGO_LOG_SERVER_PORT: 80
-      CLICKHOUSE_HOST: clickhouse
-      no_proxy: clickhouse,grafana,vector,nuclio,opa,${no_proxy:-}
+      <<: *backend-env
       NUMPROCS: 2
     command: run worker.analytics_reports
     volumes: