chore: Improve RC release notes (#2361)

.github/workflows/nightly.yml

@@ -100,8 +100,6 @@ jobs:
       title: "Clio development (nightly) build"
       version: nightly
       header: >
-        # Release notes
-
         > **Note:** Please remember that this is a development release and it is not recommended for production use.
 
         Changelog (including previous releases): <https://github.com/XRPLF/clio/commits/nightly>

.github/workflows/release.yml

@@ -52,6 +52,6 @@ jobs:
       title: "${{ github.ref_name}}"
       version: "${{ github.ref_name }}"
       header: >
-        # Introducing Clio version ${{ github.ref_name }}
-      generate_changelog: true
+        ${{ contains(github.ref_name, '-') && '> **Note:** Please remember that this is a release candidate and it is not recommended for production use.' || '' }}
+      generate_changelog: ${{ !contains(github.ref_name, '-') }}
       draft: true

.github/workflows/release_impl.yml

@@ -68,7 +68,9 @@ jobs:
       - name: Create release notes
         shell: bash
         run: |
-          printf '%s\n' "${{ inputs.header }}" > "${RUNNER_TEMP}/release_notes.md"
+          echo "# Release notes" > "${RUNNER_TEMP}/release_notes.md"
+          echo "" >> "${RUNNER_TEMP}/release_notes.md"
+          printf '%s\n' "${{ inputs.header }}" >> "${RUNNER_TEMP}/release_notes.md"
 
       - name: Generate changelog
         shell: bash
@@ -77,7 +79,7 @@ jobs:
           LAST_TAG="$(gh release view --json tagName -q .tagName)"
           LAST_TAG_COMMIT="$(git rev-parse $LAST_TAG)"
           BASE_COMMIT="$(git merge-base HEAD $LAST_TAG_COMMIT)"
-          git-cliff "${BASE_COMMIT}..HEAD" --ignore-tags "nightly|-b"
+          git-cliff "${BASE_COMMIT}..HEAD" --ignore-tags "nightly|-b|-rc"
           cat CHANGELOG.md >> "${RUNNER_TEMP}/release_notes.md"
 
       - name: Prepare release artifacts