Add env vars config example

docs/config/index.md

@@ -5,7 +5,7 @@
 There are two different ways to define configuration in Diun:
 
 * In a [configuration file](#configuration-file)
-* As environment variables
+* As [environment variables](#environment-variables)
 
 These ways are evaluated in the order listed above.
 
@@ -17,84 +17,164 @@ For example, the `DIUN_PROVIDERS_DOCKER` environment variable is enough by itsel
 
 You can define a configuration file through the option `--config` with the following content:
 
-```yaml
-db:
-  path: diun.db
+??? example "diun.yml"
+    ```yaml
+    db:
+      path: diun.db
+    
+    watch:
+      workers: 10
+      schedule: "0 * * * *"
+      firstCheckNotif: false
+    
+    notif:
+      amqp:
+        host: localhost
+        port: 5672
+        username: guest
+        password: guest
+        queue: queue
+      gotify:
+        endpoint: http://gotify.foo.com
+        token: Token123456
+        priority: 1
+        timeout: 10s
+      mail:
+        host: localhost
+        port: 25
+        ssl: false
+        insecureSkipVerify: false
+        from: diun@example.com
+        to: webmaster@example.com
+      rocketchat:
+        endpoint: http://rocket.foo.com:3000
+        channel: "#general"
+        userID: abcdEFGH012345678
+        token: Token123456
+        timeout: 10s
+      script:
+          cmd: "myprogram"
+          args:
+            - "--anarg"
+            - "another"
+      slack:
+        webhookURL: https://hooks.slack.com/services/ABCD12EFG/HIJK34LMN/01234567890abcdefghij
+      teams:
+        webhookURL: https://outlook.office.com/webhook/ABCD12EFG/HIJK34LMN/01234567890abcdefghij
+      telegram:
+        token: aabbccdd:11223344
+        chatIDs:
+          - 123456789
+          - 987654321
+      webhook:
+        endpoint: http://webhook.foo.com/sd54qad89azd5a
+        method: GET
+        headers:
+          content-type: application/json
+          authorization: Token123456
+        timeout: 10s
+    
+    regopts:
+      someregistryoptions:
+        username: foo
+        password: bar
+        timeout: 20s
+      onemore:
+        username: foo2
+        password: bar2
+        insecureTLS: true
+    
+    providers:
+      docker:
+        watchStopped: true
+      swarm:
+        watchByDefault: true
+      kubernetes:
+        namespaces:
+          - default
+          - production
+      file:
+        directory: ./imagesdir
+    ```
 
-watch:
-  workers: 10
-  schedule: "0 * * * *"
-  firstCheckNotif: false
+## Environment variables
 
-notif:
-  amqp:
-    host: localhost
-    port: 5672
-    username: guest
-    password: guest
-    queue: queue
-  gotify:
-    endpoint: http://gotify.foo.com
-    token: Token123456
-    priority: 1
-    timeout: 10s
-  mail:
-    host: localhost
-    port: 25
-    ssl: false
-    insecureSkipVerify: false
-    from: diun@example.com
-    to: webmaster@example.com
-  rocketchat:
-    endpoint: http://rocket.foo.com:3000
-    channel: "#general"
-    userID: abcdEFGH012345678
-    token: Token123456
-    timeout: 10s
-  script:
-      cmd: "myprogram"
-      args:
-        - "--anarg"
-        - "another"
-  slack:
-    webhookURL: https://hooks.slack.com/services/ABCD12EFG/HIJK34LMN/01234567890abcdefghij
-  teams:
-    webhookURL: https://outlook.office.com/webhook/ABCD12EFG/HIJK34LMN/01234567890abcdefghij
-  telegram:
-    token: aabbccdd:11223344
-    chatIDs:
-      - 123456789
-      - 987654321
-  webhook:
-    endpoint: http://webhook.foo.com/sd54qad89azd5a
-    method: GET
-    headers:
-      content-type: application/json
-      authorization: Token123456
-    timeout: 10s
+All configuration from file can be transposed into environment variables. As an example, the following configuration:
 
-regopts:
-  someregistryoptions:
-    username: foo
-    password: bar
-    timeout: 20s
-  onemore:
-    username: foo2
-    password: bar2
-    insecureTLS: true
+??? example "diun.yml"
+    ```yaml
+    db:
+      path: diun.db
+    
+    watch:
+      workers: 10
+      schedule: "0 * * * *"
+      firstCheckNotif: false
+    
+    notif:
+      gotify:
+        endpoint: http://gotify.foo.com
+        token: Token123456
+        priority: 1
+        timeout: 10s
+      telegram:
+        token: aabbccdd:11223344
+        chatIDs:
+          - 123456789
+          - 987654321
+      webhook:
+        endpoint: http://webhook.foo.com/sd54qad89azd5a
+        method: GET
+        headers:
+          content-type: application/json
+          authorization: Token123456
+        timeout: 10s
+    
+    regopts:
+      someregistryoptions:
+        username: foo
+        password: bar
+        timeout: 20s
+    
+    providers:
+      kubernetes:
+        tlsInsecure: false
+        namespaces:
+          - default
+          - production
+    ```
 
-providers:
-  docker:
-    watchStopped: true
-  swarm:
-    watchByDefault: true
-  kubernetes:
-    namespaces:
-      - default
-      - production
-  file:
-    directory: ./imagesdir
-```
+Can be transposed to:
+
+??? example "environment variables"
+    ```
+    DIUN_DB_PATH=diun.db
+    
+    DIUN_WATCH_WORKERS=10
+    DIUN_WATCH_SCHEDULE=0 * * * *
+    DIUN_WATCH_FIRSTCHECKNOTIF=false
+    
+    DIUN_NOTIF_GOTIFY_ENDPOINT=http://gotify.foo.com
+    DIUN_NOTIF_GOTIFY_TOKEN=Token123456
+    DIUN_NOTIF_GOTIFY_PRIORITY=1
+    DIUN_NOTIF_GOTIFY_TIMEOUT=10s
+    
+    DIUN_NOTIF_TELEGRAM_TOKEN=aabbccdd:11223344
+    DIUN_NOTIF_TELEGRAM_CHATIDS=123456789,987654321
+    
+    DIUN_NOTIF_WEBHOOK_ENDPOINT=http://webhook.foo.com/sd54qad89azd5a
+    DIUN_NOTIF_WEBHOOK_METHOD=GET
+    DIUN_NOTIF_WEBHOOK_HEADERS_CONTENT-TYPE=application/json
+    DIUN_NOTIF_WEBHOOK_HEADERS_AUTHORIZATION=Token123456
+    DIUN_NOTIF_WEBHOOK_TIMEOUT=10s
+    
+    DIUN_REGOPTS_SOMEREGISTRYOPTIONS_USERNAME=foo
+    DIUN_REGOPTS_SOMEREGISTRYOPTIONS_PASSWORD=bar
+    DIUN_REGOPTS_SOMEREGISTRYOPTIONS_TIMEOUT=20s
+    
+    PROVIDERS_KUBERNETES_TLSINSECURE=false
+    PROVIDERS_KUBERNETES_NAMESPACES=default,production
+    ```
 
 ## Reference