ci: migrate to shared workflows (#1)

Replace the generic ci.yml jobs with the shared go-pr and go-release workflows.
Add autoupdate through shared go-autoupdate.
Keep golangci-lint in a separate lint.yaml, because the shared workflows do not run it.
Add a build-less .goreleaser.yaml so the shared release flow can tag and publish the library.

.github/workflows/autoupdate.yaml

@@ -0,0 +1,20 @@
+name: Autoupdate go.mod and go.sum
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 3 * * *"
+
+permissions:
+  contents: write
+  actions: write
+  pull-requests: write
+  security-events: write
+
+jobs:
+  autoupdate:
+    uses: lukaszraczylo/shared-actions/.github/workflows/go-autoupdate.yaml@main
+    with:
+      go-version: ">=1.22"
+      release-workflow: "release.yaml"
+    secrets: inherit