[GITEA] Add password length check on install page

- Resolves #271
- Ensure that the adminstrator password is at least `MIN_PASSWORD_LENGTH`.

(cherry picked from commit 28cb04c3f5)
(cherry picked from commit 95371ebd92)
(cherry picked from commit a134288ab6)
(cherry picked from commit 4202f052cb)
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(cherry picked from commit 083d5aefed)
(cherry picked from commit 4586096be9)
(cherry picked from commit 039fa20cc8)
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(cherry picked from commit a156603002)
(cherry picked from commit 4d305e7774)
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(cherry picked from commit 58e354c98e)
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(cherry picked from commit d457b9c911)
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(cherry picked from commit d3b24691f3)
(cherry picked from commit 736dfab3ae)
(cherry picked from commit 8be95ef7f4)

routers/install/install.go

@@ -358,6 +358,12 @@ func SubmitInstall(ctx *context.Context) {
 			ctx.RenderWithErr(ctx.Tr("form.password_not_match"), tplInstall, form)
 			return
 		}
+		if len(form.AdminPasswd) < setting.MinPasswordLength {
+			ctx.Data["Err_Admin"] = true
+			ctx.Data["Err_AdminPasswd"] = true
+			ctx.RenderWithErr(ctx.Tr("auth.password_too_short", setting.MinPasswordLength), tplInstall, form)
+			return
+		}
 	}
 
 	// Init the engine with migration