docs: record GOTOOLCHAIN fix

.gitea/workflows/prepare-release.yml

@@ -50,11 +50,15 @@ jobs:
 
       - name: Run gosec security analysis
         uses: securego/gosec@v2.22.4
+        env:
+          GOTOOLCHAIN: auto
         with:
           args: ./...
 
       - name: Run govulncheck
         uses: golang/govulncheck-action@v1.0.4
+        env:
+          GOTOOLCHAIN: auto
         with:
           go-package: ./...
           cache: true

CHANGELOG.md

@@ -38,6 +38,7 @@ A `### Breaking` section is used in addition to Keep a Changelog's standard sect
 - Fixed `decorate-pr/action.yml` YAML validation by extracting PR comment rendering into `decorate-pr/build-comment.sh`, removing the duplicated changelog extraction step, and correcting the gate failure output reference.
 - Fixed docs-only detection in `decorate-pr` changelog gate: file list was iterated in a piped subshell so `docs_only` never propagated to the parent scope; replaced pipe with process substitution.
 - Pinned `securego/gosec` and `golang/govulncheck-action` to concrete version tags (`v2.22.4` and `v1.0.4`) so self-hosted Gitea runners can resolve them via direct git clone without relying on the GitHub Actions floating-tag API.
+- Added `GOTOOLCHAIN: auto` environment variable to `gosec` and `govulncheck-action` steps in `push-validation` and `prepare-release` workflows to prevent Go toolchain version mismatches inside the act runner container.
 
 ## [1.0.2] - 2026-03-21