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>

.yamllint.yaml

@@ -0,0 +1,13 @@
+# yamllint config for the homeserver repo.
+# Relaxed to match the repo's existing YAML style (configs + docker-compose +
+# Gitea Actions workflows), mirroring the line-length leniency in .markdownlint.json.
+extends: default
+
+rules:
+  # Many service/compose configs have long values (URLs, labels); don't enforce width.
+  line-length: disable
+  # Config and compose files don't use explicit "---" document starts.
+  document-start: disable
+  # Allow workflow keys like `on:` (parsed as boolean) without quoting.
+  truthy:
+    check-keys: false