Merge pull request 'COMPOSE_FILE=$COMPOSE_FILE:`, to combine 'em easier' (#27) from rejig-compose-vars into master

Reviewed-on: coop-cloud/traefik#27

.env.sample

@@ -8,54 +8,79 @@ LETS_ENCRYPT_EMAIL=certs@example.com
 # WARN, INFO etc.
 LOG_LEVEL=WARN
 
+# This is here so later lines can extend the definition; you likely don't wanna
+# edit
+COMPOSE_FILE="compose.yml"
+
+#####################################################################
+# General settings                                                  #
+#####################################################################
+
+## Host-mode networking
+#COMPOSE_FILE="$COMPOSE_FILE:compose.host.yml"
+
+## "Headless mode" (no domain configured)
+#COMPOSE_FILE="$COMPOSE_FILE:compose.headless.yml"
+
+#####################################################################
+# Automatic DNS set-up for Letsencrypt                              #
+#####################################################################
+
 ## Enable dns challenge (for wildcard domains)
 ##   https://doc.traefik.io/traefik/https/acme/#dnschallenge
 #LETS_ENCRYPT_DNS_CHALLENGE_ENABLED=1
 #LETS_ENCRYPT_DNS_CHALLENGE_PROVIDER=ovh
 
-## OVH configuration
-# COMPOSE_FILE="compose.yml:compose.ovh.yml"
-# OVH_ENABLED=1
-# OVH_APPLICATION_KEY=
-# OVH_ENDPOINT=
-# SECRET_OVH_APP_SECRET_VERSION=v1
-# SECRET_OVH_CONSUMER_KEY=v1
+## OVH, https://ovh.com
+#COMPOSE_FILE="$COMPOSE_FILE:compose.ovh.yml"
+#OVH_ENABLED=1
+#OVH_APPLICATION_KEY=
+#OVH_ENDPOINT=
+#SECRET_OVH_APP_SECRET_VERSION=v1
+#SECRET_OVH_CONSUMER_KEY=v1
 
-## Gandi configuration
-# COMPOSE_FILE="compose.yml:compose.gandi.yml"
-# GANDI_ENABLED=1
-# SECRET_GANDIV5_API_KEY_VERSION=v1
+## Gandi, https://gandi.net
+## note(3wc): only "V5" (new) API is supported, so far
+#COMPOSE_FILE="$COMPOSE_FILE:compose.gandi.yml"
+#GANDI_ENABLED=1
+#SECRET_GANDIV5_API_KEY_VERSION=v1
+
+#####################################################################
+# Keycloak log-in                                                   #
+#####################################################################
 
 ## Enable Keycloak
-#COMPOSE_FILE="compose.yml:compose.keycloak.yml"
+#COMPOSE_FILE="$COMPOSE_FILE:compose.keycloak.yml"
 #KEYCLOAK_MIDDLEWARE_ENABLED=1
 
+#####################################################################
+# Additional services                                               #
+#####################################################################
+
 ## SMTP port 587
-#COMPOSE_FILE="compose.yml:compose.smtp.yml"
+#COMPOSE_FILE="$COMPOSE_FILE:compose.smtp.yml"
 #SMTP_ENABLED=1
 
 ## Gitea SSH
-# COMPOSE_FILE="compose.yml:compose.gitea.yml"
+# COMPOSE_FILE="$COMPOSE_FILE:compose.gitea.yml"
 # GITEA_SSH_ENABLED=1
 
 ## Foodsoft SMTP
-# COMPOSE_FILE="compose.yml:compose.foodsoft.yml"
+# COMPOSE_FILE="$COMPOSE_FILE:compose.foodsoft.yml"
 # FOODSOFT_SMTP_ENABLED=1
 
 ## Peertube RTMP
-# COMPOSE_FILE="compose.yml:compose.peertube.yml"
-# PEERTUBE_RTMP_ENABLED=1
+#COMPOSE_FILE="$COMPOSE_FILE:compose.peertube.yml"
+#PEERTUBE_RTMP_ENABLED=1
 
 ## Secure Scuttlebutt MUXRPC
-# COMPOSE_FILE="compose.yml:compose.ssb.yml"
-# SSB_MUXRPC_ENABLED=1
+#COMPOSE_FILE="$COMPOSE_FILE:compose.ssb.yml"
+#SSB_MUXRPC_ENABLED=1
 
 ## MSSQL
-# COMPOSE_FILE="compose.yml:compose.mssql.yml"
-# MSSQL_ENABLED=1
+#COMPOSE_FILE="$COMPOSE_FILE:compose.mssql.yml"
+#MSSQL_ENABLED=1
 
-## Host-mode networking
-#COMPOSE_FILE="compose.yml:compose.host.yml"
-
-## "Headless mode" (no domain configured)
-#COMPOSE_FILE="compose.yml:compose.headless.yml"
+## Mumble
+#COMPOSE_FILE="$COMPOSE_FILE:compose.mumble.yml"
+#MUMBLE_ENABLED=1