fix(release): write install.yaml outside dist for goreleaser dist check (#28)

## Summary

GoReleaser pipe order: \`--clean\` wipes \`dist\` (step 1), then
\`before:hooks\` runs (step 2), then the dist pipe re-checks \`dist\` is
empty (step 3). PR #25 put \`make installer\` in \`before:hooks\`, which
writes to \`dist/install.yaml\` and re-populates the directory before
step 3 runs:

\`\`\`
dist is not empty, remove it before running goreleaser or use the
--clean flag
\`\`\`

Fix: move \`install.yaml\` out of \`dist/\` inside the hook
(\`release-assets/\`), update \`release.extra_files\`.

## Test plan

- [ ] v0.1.6 release workflow goreleaser step succeeds
- [ ] install.yaml attached to GitHub release

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

Author: stubbi

.goreleaser.yaml

@@ -2,11 +2,13 @@ version: 2
 
 project_name: hermes-operator
 
-# Run after --clean wipes dist/, before archives/release glob extra_files.
-# The CI workflow also has setup-go + kubectl + kustomize available.
+# Run before goreleaser populates dist/ but after --clean wipes it.
+# make installer writes dist/install.yaml; move it to release-assets/ so
+# goreleaser's own "dist must be empty" check passes, then glob it from
+# release.extra_files.
 before:
   hooks:
-    - make installer
+    - sh -c "make installer && mkdir -p release-assets && mv dist/install.yaml release-assets/install.yaml && rmdir dist"
 
 builds:
   - id: manager
@@ -60,4 +62,4 @@ release:
     owner: stubbi
     name: hermes-operator
   extra_files:
-    - glob: dist/install.yaml
+    - glob: release-assets/install.yaml