Add more test directory to exclude dir of air, remove watching templates from air include dir because gitea has internal mechanism

[lunny]

Since #20218 introduced internal watching template, template watching should be removed from air. This will prevent restart the whole server but only recompile templates once the template files changed to speed up developing when using make watch. Now a template change will only spend less than 1s in my macbook 2019 but over 20s before.

To ensure make watch will reuse template watching, this PR introduced a new ENV GITEA_RUN_MODE to make sure make watch will always run in a dev mode of Gitea so that template watching will open.

This PR also added more exclude testdata directories.

[silverwind]

Will template changes still reload the dev server after this? It'd certainly be useful to not have to manually restart on template change.

[KN4CK3R]

Same question from my side. Editing a template file was also a very fast way to force a restart.

[lunny]

Will template changes still reload the dev server after this? It'd certainly be useful to not have to manually restart on template change.

Template changes will not reload the dev server any more but will fire internal template watching, that means only templates will be recompiled again once template changed and no any manually operation needed. This is obviously faster than before, because there is no server restart, no database init, no web listen and etc.

[lunny]

Same question from my side. Editing a template file was also a very fast way to force a restart.

You could change a go file to implement it now.

[KN4CK3R]

Same question from my side. Editing a template file was also a very fast way to force a restart.

You could change a go file to implement it now.

Sure but now I need to search for a file which does not force recompilation of a big part of our codebase to make it fast. But that was just convenience.

[lunny]

Same question from my side. Editing a template file was also a very fast way to force a restart.

You could change a go file to implement it now.

Sure but now I need to search for a file which does not force recompilation of a big part of our codebase to make it fast. But that was just convenience.

You can always edit main.go because no other code depend it.

[silverwind]

If template changes automatically reload it in the server without a restart, that's fine with me. So on next F5, it should serve the new template. I will try it.