Create radicale.md

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apps/contacts-calendars/radicale.md

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+# docker-radicale
+
+Radicale is a small but powerful CalDAV (calendars, to-do lists) and CardDAV (contacts) server
+
+<br>
+
+- [Github repo](https://github.com/tomsquest/docker-radicale)
+
+- [configuration file](https://github.com/tomsquest/docker-radicale/blob/master/config)
+
+
+```yml
+services:
+  radicale:
+    image: tomsquest/docker-radicale
+    container_name: radicale
+    ports:
+      - 5232:5232
+    init: true
+    read_only: true
+    security_opt:
+      - no-new-privileges:true
+    healthcheck:
+      test: curl -f http://127.0.0.1:5232 || exit 1
+      interval: 30s
+      retries: 3
+restart: unless-stopped
+    volumes:
+      - ./data:/data
+      - ./config:/config:ro
+      - ./users:/etc/radicale/users
+```
+
+## Tips & tricks
+
+### configuration file
+
+create a config directory in the working dir
+
+`mkdir -p config`
+
+copy the configuration file from the link above into the config folder 
+
+
+### Basic auth
+
+Uncomment/Enable the following in the configuration file
+
+ ```
+[auth]
+type = htpasswd
+htpasswd_filename = /etc/radicale/users
+htpasswd_encryption = md5
+```
+
+### htpasswd
+
+flat-file used to store usernames and password for basic authentication 
+
+While in the working dir
+
+```
+htpasswd -c users username
+New password:
+Re-type new password:
+```