feat(releaseprep): migrate standalone tool into vociferate

action.yml

@@ -0,0 +1,63 @@
+name: releaseprep
+description: Prepare release files or recommend a next semantic version tag.
+
+inputs:
+  version:
+    description: Semantic version to release.
+    required: false
+  version-file:
+    description: Path to version file relative to repository root.
+    required: false
+    default: ''
+  version-pattern:
+    description: Regular expression with one capture group for current version.
+    required: false
+    default: ''
+  changelog:
+    description: Path to changelog file relative to repository root.
+    required: false
+    default: changelog.md
+  recommend:
+    description: If true, print recommended next release tag.
+    required: false
+    default: 'false'
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/checkout@v4
+
+    - uses: actions/setup-go@v5
+      with:
+        go-version: '1.26.1'
+
+    - name: Run releaseprep
+      shell: bash
+      run: |
+        set -euo pipefail
+
+        args=(--root .)
+
+        if [[ "${{ inputs.recommend }}" == "true" ]]; then
+          args+=(--recommend)
+        else
+          if [[ -z "${{ inputs.version }}" ]]; then
+            echo "input 'version' is required when recommend is false" >&2
+            exit 2
+          fi
+          args+=(--version "${{ inputs.version }}" --date "$(date -u +%F)")
+        fi
+
+        if [[ -n "${{ inputs.version-file }}" ]]; then
+          args+=(--version-file "${{ inputs.version-file }}")
+        fi
+
+        if [[ -n "${{ inputs.version-pattern }}" ]]; then
+          args+=(--version-pattern "${{ inputs.version-pattern }}")
+        fi
+
+        if [[ -n "${{ inputs.changelog }}" ]]; then
+          args+=(--changelog "${{ inputs.changelog }}")
+        fi
+
+        go run git.hrafn.xyz/aether/vociferate/cmd/releaseprep@latest "${args[@]}"