* test: integration add git cli tests

Extracted form for easing review process and debug #3152

* test: integration add git cli big file commit

* fix:  Don't rewrite key if internal server

* Fixes API-Endpoint release (#3005)

* Using context.ReferencesGitRepo(); doing the same in the PATCH route.

* Add release create, get and update test

* Populate repo indexer in background

* Check if no repos exist

* race cond

* General refactor of the cmd package

* Address breakage in runCreateUser

* Place "common" functions into cmd.go

Now includes all the template hooks in the page, and a detailed
example for the common case of adding an "about" page.

* Remove hardcoded paths to fix randomly failing tests

* Use correct function for merge path

* Replace all ctx.Handle with ctx.ServerError or ctx.NotFound

* Change Handle(403) to NotFound, avoid using macaron's NotFound

These templates add content to the top navbar
and to the repository page.
This way we do not have to copy and modify the whole
template, and re-modify it after upgrading Gitea if
it changes.

Signed-off-by: Alberto González Palomo <bugs@sentido-labs.com>

* Clean up spelling, grammar, perspective, whitespace, language, markup, etc.

* Update gitea version on docs/install-from-binary

* Update all versions

* Change EncodePasswd to HashPassword

* Create test+benchmark for HashPassword

* Add some instructions about running integration tests

* Add missing newline escape

* Suggest running a clean build

* Fixes #3303

* Add missing indexer doc in configuration

* Unify MAX_FILE_SIZE to 1024 * 1024

* Serve .patch for pull requests

Closes #3259
Updates "git" module, for GetFormatPatch

* Handle io.Copy error

The makefile did not download the theme if the directory "themes/gitea"
is there, even if empty.
On a fresh Ubuntu install, curl is not included, so the theme rule fails
just after creating the empty directory. When you try again after
installing curl, the rule is not triggered.

This could also happen if the download fails for other reasons.

This change makes the theme rule depend on the file "theme.toml"
which will be there only after unpacking a successfully downloaded
theme archive.

Signed-off-by: Alberto González Palomo <bugs@sentido-labs.com>

Pre-existing installs still have it default to off.
This is consistent with OpenID setting.

* Add is_writable checkbox to deploy keys interface

* Add writable key option to deploy key form

* Add support for writable ssh keys in the interface

* Rename IsWritable to ReadOnly

* Test: create read-only and read-write deploy keys via api

* Add DeployKey access mode migration

* Update gitea sdk via govendor

* Fix deploykey migration

* Add unittests for writable deploy keys

* Move template text to locale

* Remove implicit column update

* Remove duplicate locales

* Replace ReadOnly field with IsReadOnly method

* Fix deploy_keys related integration test

* Rename v54 migration with v55

* Fix migration hell

* Add defaults to config cheatsheet, and clean up document.

* Updates and touchups, per review.