ci: created Docker env vars

Following api-platform/api-platform#1965

.env.caddy.php-bluegreen.redis.database.prod

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+# .env.caddy.php-bluegreen.redis.database.prod
+#
+# Runs docker with a production setup
+#
+# - 2 php services: php-blue and php-green
+# - redis for sessions
+# - node-build container for building JavaScript and CSS
+# - database running in docker
+#
+# @see https://github.com/api-platform/api-platform/pull/1965
+# @see https://docs.docker.com/compose/environment-variables/envvars/#compose_file
+#
+# Usage: copy to .env so docker composer can use it
+SERVER_NAME="localhost"
+CADDY_MERCURE_JWT_SECRET=${CADDY_MERCURE_JWT_SECRET:-ChangeMe}
+POSTGRES_HOST=database
+GIT_SHA=$GITHUB_SHA
+COMPOSE_FILE=docker-compose.bluegreen.yml:docker-compose.database.yml:docker-compose.bluegreen.database.yml

.env.caddy.php-bluegreen.redis.prod

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+# .env.caddy.php-bluegreen.redis.prod
+#
+# Runs docker with a production setup (no database in docker)
+#
+# - 2 php services: php-blue and php-green
+# - redis for sessions
+# - node-build container for building JavaScript and CSS
+# - database running on host (local would be on Mac)
+#
+# @see https://github.com/api-platform/api-platform/pull/1965
+# @see https://docs.docker.com/compose/environment-variables/envvars/#compose_file
+#
+# Usage: copy to .env so docker composer can use it
+CADDY_MERCURE_JWT_SECRET=${CADDY_MERCURE_JWT_SECRET:-ChangeMe}
+POSTGRES_USER=${POSTGRES_USER:-app}
+POSTGRES_PASSWORD=''
+POSTGRES_HOST=host.docker.internal
+GIT_SHA=$GITHUB_SHA
+COMPOSE_FILE=docker-compose.bluegreen.yml

.env.caddy.php.database.dev

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+# .env.caddy.php.database.dev
+#
+# Start caddy, php (from the dev base), and the database
+#
+# Also used in CI in order to be able to run tests
+#
+# @see https://github.com/api-platform/api-platform/pull/1965
+# @see https://docs.docker.com/compose/environment-variables/envvars/#compose_file
+#
+# Usage: copy to .env so docker composer can use it
+SERVER_NAME="localhost"
+POSTGRES_HOST=database
+GIT_SHA=$GITHUB_SHA
+COMPOSE_FILE=docker-compose.yml:docker-compose.override.yml:docker-compose.database.yml