Set RUN_MODE prod by default (go-gitea#13765)

I think it's a bad default to have "dev" as the default run mode which
enables debugging and now also disables HTTP caching. It's better to
just default to a value suitable for general deployments.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Author: silverwind

custom/conf/app.example.ini

@@ -8,8 +8,8 @@
 APP_NAME = Gitea: Git with a cup of tea
 ; Change it if you run locally
 RUN_USER = git
-; Either "dev", "prod" or "test", default is "dev"
-RUN_MODE = dev
+; Application run mode, affects performance and debugging. Either "dev", "prod" or "test", default is "prod"
+RUN_MODE = prod
 
 [project]
 ; Default templates for project boards

docker/root/etc/s6/gitea/setup

@@ -25,7 +25,7 @@ if [ ! -f ${GITEA_CUSTOM}/conf/app.ini ]; then
 
     # Substitude the environment variables in the template
     APP_NAME=${APP_NAME:-"Gitea: Git with a cup of tea"} \
-    RUN_MODE=${RUN_MODE:-"dev"} \
+    RUN_MODE=${RUN_MODE:-"prod"} \
     DOMAIN=${DOMAIN:-"localhost"} \
     SSH_DOMAIN=${SSH_DOMAIN:-"localhost"} \
     HTTP_PORT=${HTTP_PORT:-"3000"} \

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -36,9 +36,7 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
 - `APP_NAME`: **Gitea: Git with a cup of tea**: Application name, used in the page title.
 - `RUN_USER`: **git**: The user Gitea will run as. This should be a dedicated system
    (non-user) account. Setting this incorrectly will cause Gitea to not start.
-- `RUN_MODE`: **dev**: For performance and other purposes, change this to `prod` when
-   deployed to a production environment. The installation process will set this to `prod`
-   automatically. \[prod, dev, test\]
+- `RUN_MODE`: **prod**: Application run mode, affects performance and debugging. Either "dev", "prod" or "test".
 
 ## Repository (`repository`)
 

docs/content/doc/installation/with-docker.en-us.md

@@ -257,7 +257,7 @@ You can configure some of Gitea's settings via environment variables:
 (Default values are provided in **bold**)
 
 * `APP_NAME`: **"Gitea: Git with a cup of tea"**: Application name, used in the page title.
-* `RUN_MODE`: **dev**: For performance and other purposes, change this to `prod` when deployed to a production environment.
+* `RUN_MODE`: **prod**: Application run mode, affects performance and debugging. Either "dev", "prod" or "test".
 * `DOMAIN`: **localhost**: Domain name of this server, used for the displayed http clone URL in Gitea's UI.
 * `SSH_DOMAIN`: **localhost**: Domain name of this server, used for the displayed ssh clone URL in Gitea's UI. If the install page is enabled, SSH Domain Server takes DOMAIN value in the form (which overwrite this setting on save).
 * `SSH_PORT`: **22**: SSH port displayed in clone URL.