添加 mysql redis postgres 插件

plugins/postgres/docs/README.md

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+# Extra Documentation
+
+The documentation in this folder is supplemental to using this plugin. It is injected automatically into the plugin's readme during documentation generation.
+

plugins/postgres/docs/create.md

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+Official Postgres "$DOCKER_BIN" image ls does not include postgis extension (amongst others). The following example creates a new postgres service using `postgis/postgis:13-3.1` image, which includes the `postgis` extension.
+
+```shell
+# use the appropriate image-version for your use-case
+dokku postgres:create postgis-database --image "postgis/postgis" --image-version "13-3.1"
+```
+
+To use pgvector instead, run the following:
+
+```shell
+# use the appropriate image-version for your use-case
+dokku postgres:create pgvector-database --image "pgvector/pgvector" --image-version "pg17"
+```

plugins/postgres/docs/export.md

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+Note that the export will result in a file containing the binary postgres export data. It can be converted to plain text using `pg_restore` as follows
+
+```shell
+pg_restore data.dump -f plain.sql
+```

plugins/postgres/docs/upgrade.md

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+Postgres does not handle upgrading data for major versions automatically (eg. 11 => 12). Upgrades should be done manually. Users are encouraged to upgrade to the latest minor release for their postgres version before performing a major upgrade.
+
+While there are many ways to upgrade a postgres database, for safety purposes, it is recommended that an upgrade is performed by exporting the data from an existing database and importing it into a new database. This also allows testing to ensure that applications interact with the database correctly after the upgrade, and can be used in a staging environment.
+
+The following is an example of how to upgrade a postgres database named `lollipop-11` from 11.13 to 12.8.
+
+```shell
+# stop any linked apps
+dokku ps:stop linked-app
+
+# export the database contents
+dokku postgres:export lollipop-11 > /tmp/lollipop-11.export
+
+# create a new database at the desired version
+dokku postgres:create lollipop-12 --image-version 12.8
+
+# import the export file
+dokku postgres:import lollipop-12 < /tmp/lollipop-11.export
+
+# run any sql tests against the new database to verify the import went smoothly
+
+# unlink the old database from your apps
+dokku postgres:unlink lollipop-11 linked-app
+
+# link the new database to your apps
+dokku postgres:link lollipop-12 linked-app
+
+# start the linked apps again
+dokku ps:start linked-app
+```