Release pipeline: cargo-release config + Gitea Actions workflows

- release.toml: one shared workspace version, single vX.Y.Z tag,
  full test suite as the pre-release gate, no crates.io publishing.
- .gitea/workflows/ci.yml: the Woodpecker quality bar (fmt, clippy
  -D warnings, tests) for repos served by act_runner.
- .gitea/workflows/release.yml: on a version tag, build stripped
  release binaries for x86_64 and aarch64 Linux, bundle them with the
  systemd units, rendered man pages and example config, and attach the
  tarballs (+ sha256) to a Gitea release via the API.
- dist/PKGBUILD: point at the repo's new home on project.uhhm.no.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dist/PKGBUILD

@@ -8,7 +8,7 @@ pkgver=0.1.0
 pkgrel=1
 pkgdesc="Content-addressed blob mirror daemon on iroh"
 arch=('x86_64' 'aarch64')
-url="https://github.com/bendiklh/varde"
+url="https://project.uhhm.no/uhhm/varde"
 license=('MIT OR Apache-2.0')
 depends=('gcc-libs')
 optdepends=('networkmanager: metered-connection detection')