docs: Update Changelog for release v1.27.1 (#38670)

Add changelog for version 1.27.1 with security, API, enhancements, bug
fixes, build updates, and miscellaneous changes.

---------

Signed-off-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

CHANGELOG.md

@@ -4,6 +4,64 @@ This changelog goes through the changes that have been made in each release
 without substantial changes to our git log; to see the highlights of what has
 been added to each release, please refer to the [blog](https://blog.gitea.com).
 
+## [1.27.1](https://github.com/go-gitea/gitea/releases/tag/v1.27.1) - 2026-07-27
+
+* SECURITY
+  * fix(oauth2): enforce mandatory 2FA policy on OAuth2 authorize/grant endpoints (#38591) (#38606)
+
+* API
+  * fix(api): align Swagger schemas for UserSettings and TopicListResponse (#38590) (#38592)
+
+* ENHANCEMENTS
+  * enhance: improve diff contrast in light and dark themes (#37477) (#38574)
+
+* BUGFIXES
+  * fix: skip OIDC end-session after password login for OAuth2 users (#38439) (#38666)
+  * fix: make Actions log parser support multiple line message encoding (#38659) (#38664)
+  * fix(actions): use base branch ref for pull_request_target context (#38636) (#38657)
+  * fix(actions): skip already-approved runs in `ApproveRuns` (#38653) (#38654)
+  * fix: orgmode render include path (#38642) (#38645)
+  * fix(actions): cancel tasks immediately when the runner stopped reporting (#38616) (#38644)
+  * fix(issues): fix label bulk-load key and reduce log noise in LoadLabel (#38632) (#38643)
+  * fix(actions): improve runner list status sorting, labels and task job links (#38586) (#38633)
+  * fix(actions): correctness and hardening fixes (#38518) (#38631)
+  * fix(repo): prevent double-write redirect collisions on dependency errors, fix ui (#38627) (#38628)
+  * fix: delete repo-scoped rows of seven more tables when deleting a repository (#38534) (#38618)
+  * fix(webhook): remove slack channel name check (#38608) (#38612)
+  * fix: download dropdown menu clipped on the branches page (#38604) (#38609)
+  * fix(project): prevent database mutations on invalid MoveIssues payload (#38600) (#38602)
+  * fix(actions): make SingleWorkflow.Marshal round-trip multi-line run blocks (stop silent job stranding) (#38520) (#38599)
+  * fix(file-tree): handle submodule links and missing view container (#38033) (#38589)
+  * fix(actions): fail unexpandable reusable workflow callers and decouple the job emitter's cross-run processing (#38565) (#38587)
+  * fix: keep serving valid ACME cert when renewal fails at startup (#38554) (#38583)
+  * fix: branch protection user list (#38570) (#38584)
+  * fix(pulls): respect diff.orderFile in diff file tree (#38566) (#38578)
+  * fix(issue): make issue action (issue list batch operation) elements have correct attributes (#38575) (#38580)
+  * fix(actions): support `matrix` when evaluating workflow `if` expression (#38474) (#38557)
+  * fix(actions): align status icon span for Safari rendering (#38558) (#38562)
+  * fix: revert git clone http redirection forbidden (#38530) (#38545)
+  * fix: clean up orphaned user-keyed tables in deleteUser (#38511) (#38514)
+  * fix(actions): coerce workflow_dispatch boolean inputs to native types (#38472) (#38521)
+  * fix: make the merge box button red if some checks fail (#38508) (#38516)
+  * fix(pull): sign the commit when updating a branch by merge (#38441) (#38499)
+  * fix: make commit message merge correctly (#38490) (#38502)
+  * fix(actions): explain why a blocked or waiting job has not started (#38476) (#38498)
+  * fix(actions): make `cancelled()` work in job `if` evaluation (#38495) (#38497)
+  * fix(actions): show retention info on hover for expired artifacts (#38477) (#38493)
+  * fix(actions): group reusable-workflow matrix legs in the workflow graph (#38475) (#38492)
+  * fix: full file highlighting for git diff with CR char (#38484) (#38491)
+  * fix(packages): serve noarch Alpine index for any requested architecture (#38479) (#38486)
+  * fix: 500 error when updating user visibility (#38480) (#38483)
+  * fix(actions): make job list item fully clickable (#38462) (#38471)
+  * fix: mail template for push event (#38467) (#38468)
+  * fix: make "test push webhook" always work (#38425) (#38455)
+  * fix(actions): prevent bulk actions from affecting all runners (#38453) (#38457)
+  * fix(org): align follow button and wrap description (#38448) (#38454)
+  * fix(actions): populate `github.event` for scheduled runs (#38446) (#38452)
+
+* MISC
+  * refactor: git patch apply (#38637) (#38638)
+
 ## [1.27.0](https://github.com/go-gitea/gitea/releases/tag/v1.27.0) - 2026-07-13
 
 * BREAKING