add readme for profiles

plugins/localdump/profiles/readme.md

+# Database profiles
+
+## Introduction
+
+In this folder are several ini files.
+They describe a database environment by the [detect] section. If a profile matches then a database will be dumped or restored.
+
+## File names
+
+File convention: `<DBTYPE>_<PROFILE>.ini`
+
+* <DBTYPE> must match a database dumper in plugins/localdump/ without extension ".sh"
+* <DBTYPE>_<PROFILE> is the target folder to store backups. 
+
+  * <PROFILE> is a custom name to 
+  * _<PROFILE> can be empty to mark a local database of the given type.
+
+## Detect
+
+To detect the existance of you can use the following keys. If all found detect entries match it is counted as detected.
+
+| Key          | Type    | Description |
+|---           |---      |---          |
+| file[]       | string  | full path of a file. It must match "type". It can be given multiple times.
+| process      | regex   | A binary to be matched in the process list
+| tcp          | integer | A tcp port number that must match
+| tcp-process  | regex   | A process name offering the local tcp port (regex for last column in netstat -tulpen)
+| tcp-target   | string  | A hostname for tcp port check, eg localhost
+| type         | regex   | a matching regex for file -b FILE | grep -i REGEX; see "file[]"
+
+Example:
+
+Mysql detection in a docker container:
+
+```ini
+[detect]
+process = 'mysqld|mariadb'
+tcp = 13306
+tcp-target = localhost
+tcp-process = 'rootlesskit'
+```
+
+Multiple Sqlite files
+
+```ini
+[detect]
+file[] = "/home/axel/data/docker/ciserver/data/imldeployment/data/database/logs.db"
+file[] = "/home/axel/data/docker/ciserver/public_html/valuestore/data/versioncache.db"
+type = "sqlite"
+```
+
+## Setter
+
+If a profile detection was successful then values in the [set] section will be applied.
+
+| Key          | Type    | Description |
+|---           |---      |---          |
+| su           | string  | User for su command; used for postgres
+| dbuser       | string  | Database user; for replacement
+| dbpassword   | string  | Password of database user; for replacement
+| params       | string  | cli paramaters für dump / restore tools.
+| env          | string  | extend environment with some variables, eg. export var1="something here". After backup/ restore this variables will be unset
+
+Replacements that can be used for values `params` and `env`:
+
+| Key            | Description |
+|---             |---          |
+| {{tcp}}        | value of [detect] -> tcp
+| {{dbpassword}} | value of [set] -> dbpassword
+| {{dbuser}}     | value of [set] -> dbuser
+| {{tcp-target}} | value of [detect] -> tcp-target
+
+```ini
+[set]
+
+su = ''
+dbuser = 'root'
+dbpassword = '12345678'
+params = '--port={{tcp}} --password={{dbpassword}} --user={{dbuser}} --host={{tcp-target}}'
+
+env = 'export var1="happy meal"; export var2="new"; export var3="year!"'
+
+```