feat: Docker Compose files in repos

compose.yaml, docker-compose.yml and their variants tracked by git are
listed under Repos, their services' environment variables as secrets,
named service.VAR.

- environment as a map or a list, and <<: *anchors shared between
  services; the secret patterns pick the keys, the rest hidden, with
  compose.secretPatterns for compose files' own.
- ${VAR}, $VAR, ${VAR:?…} and variables without a value are marked as
  references; docker-compose.example.yml and the like are hidden.
- Jasypt values decrypt with the service's JASYPT_ENCRYPTOR_PASSWORD.
- A blue Docker icon, themeable with composeColor.

internal/ui/styles/styles.go

@@ -35,6 +35,7 @@ type Styles struct {
 	KindDatabricks lipgloss.Style
 	KindRepo       lipgloss.Style
 	Spring         lipgloss.Style // Spring Boot config files
+	Compose        lipgloss.Style // Docker Compose files
 
 	// themed marks the selection colours as set by the theme, so
 	// OnBackground leaves them.
@@ -72,6 +73,7 @@ func Default() Styles {
 		KindDatabricks: lipgloss.NewStyle().Foreground(lipgloss.Red),
 		KindRepo:       lipgloss.NewStyle().Foreground(lipgloss.Magenta),
 		Spring:         lipgloss.NewStyle().Foreground(lipgloss.Green),
+		Compose:        lipgloss.NewStyle().Foreground(lipgloss.Blue),
 	}
 }