Replace buildenv image with a container reference

.gitea/workflows/build.yml

@@ -9,13 +9,13 @@ on:
 
 jobs:
   audit:
-    runs-on: buildenv
+    container: buildenv:5
     steps:
       - uses: actions/checkout@v4
       - run: hlint -- src tests
 
   test:
-    runs-on: buildenv
+    container: buildenv:5
     steps:
       - uses: actions/checkout@v4
       - name: Install dependencies
@@ -25,7 +25,7 @@ jobs:
       - run: cabal test --test-show-details=streaming --enable-tests
 
   doc:
-    runs-on: buildenv
+    container: buildenv:5
     steps:
       - uses: actions/checkout@v4
       - name: Install dependencies

.gitea/workflows/release.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   release:
-    runs-on: buildenv
+    container: buildenv:5
     steps:
       - uses: actions/checkout@v4
       - name: Upload a candidate

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on
 and this project adheres to
 [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
+## [Unreleased]
+
 ## [1.5.0.2] - 2026-01-08
 ### Fixed
 - Support GHC 9.14 and containers 0.8.
@@ -555,6 +557,7 @@ and this project adheres to
 ### Added
 - Data types for the GraphQL language.
 
+[Unreleased]: https://git.caraus.tech/OSS/graphql/compare/v1.5.0.2...master
 [1.5.0.2]: https://git.caraus.tech/OSS/graphql/compare/v1.5.0.1...v1.5.0.2
 [1.5.0.1]: https://git.caraus.tech/OSS/graphql/compare/v1.5.0.0...v1.5.0.1
 [1.5.0.0]: https://git.caraus.tech/OSS/graphql/compare/v1.4.0.0...v1.5.0.0