dev-util/gitea-runner: new package at 1.0.4

Initial azy5030 overlay: scaffolding (eselect repository), the
dev-util/gitea-runner ebuild (go-module, vendored), CI build validation,
and a daily upstream-bump workflow.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

@@ -0,0 +1,28 @@
+# azy5030 overlay
+
+A personal [Gentoo ebuild repository](https://wiki.gentoo.org/wiki/Ebuild_repository)
+(overlay) for packages not in the main ::gentoo tree.
+
+## Packages
+
+| Package | Description |
+| --- | --- |
+| `dev-util/gitea-runner` | [Gitea Actions runner](https://gitea.com/gitea/runner) (formerly `act_runner`), built from upstream source with a vendored Go module tree. |
+
+## Using the overlay
+
+```sh
+eselect repository add azy5030 git https://git.azy.dev/azy5030/azy5030-overlay.git
+emaint sync -r azy5030
+echo 'dev-util/gitea-runner ~amd64' >> /etc/portage/package.accept_keywords/gitea-runner
+emerge dev-util/gitea-runner
+```
+
+## Maintenance
+
+- `.gitea/workflows/ci.yaml` builds each package in a `gentoo/stage3` container on
+  every push and asserts the resulting binary runs.
+- `.gitea/workflows/bump.yaml` runs `scripts/bump-version.sh` daily: it checks the
+  upstream releases feed and, when a newer version exists, regenerates + uploads the
+  vendor tarball, bumps the ebuild, and opens a pull request. Requires a `GITEA_TOKEN`
+  repository secret (scopes: repository read/write, write release).