ci: migrate rpm changelog generation to reusable action

Replace the local .gitea/scripts/generate-rpm-changelog.sh with the
shared composite action at https://git.lair.cafe/actions/rpm-changelog@v1.
Behaviour is identical — collect commits since the previous v* tag,
filter bump-version and merge noise, prepend a dated entry to the
spec — but the logic now lives in one place that other projects can
consume.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/scripts/generate-rpm-changelog.sh

@@ -1,65 +0,0 @@
-#!/bin/bash
-# Generate an rpm %changelog entry for this release and prepend it to
-# the spec's existing %changelog section.
-#
-# Usage: generate-rpm-changelog.sh <spec-file> <version>
-#
-# Collects commits since the previous v* tag, drops the bump-version
-# chore commits generated by CI, and writes a dated entry attributed
-# to $CHANGELOG_AUTHOR (defaults to the gitea-actions bot identity).
-
-set -euo pipefail
-
-SPEC="$1"
-VERSION="$2"
-AUTHOR="${CHANGELOG_AUTHOR:-Gitea Actions <actions@git.lair.cafe>}"
-
-if [ ! -f "$SPEC" ]; then
-  echo "error: spec file not found: $SPEC" >&2
-  exit 1
-fi
-
-# Find the previous release tag (exclude the current tag at HEAD).
-PREV_TAG=$(git describe --tags --abbrev=0 --match='v*' HEAD^ 2>/dev/null || echo "")
-
-if [ -n "$PREV_TAG" ]; then
-  RANGE="${PREV_TAG}..HEAD"
-  LOG=$(git log --no-merges --pretty=format:'- %s' "$RANGE" \
-          | grep -v '^- chore: bump version' \
-          | grep -v '^- Merge ' \
-          || true)
-else
-  LOG=""
-fi
-
-if [ -z "$LOG" ]; then
-  LOG="- No user-visible changes"
-fi
-
-DATE=$(LC_ALL=C date -u +'%a %b %d %Y')
-ENTRY="* ${DATE} ${AUTHOR} - ${VERSION}-1
-${LOG}
-"
-
-# Prepend the entry to the %changelog section.
-TMP=$(mktemp)
-awk -v entry="$ENTRY" '
-  inserted == 0 && /^%changelog[[:space:]]*$/ {
-    print
-    print entry
-    inserted = 1
-    next
-  }
-  { print }
-' "$SPEC" > "$TMP"
-
-if ! grep -q '^%changelog' "$SPEC"; then
-  echo "error: no %changelog section in $SPEC — refusing to mangle" >&2
-  rm -f "$TMP"
-  exit 1
-fi
-
-mv "$TMP" "$SPEC"
-
-echo "Added changelog entry for ${VERSION}:"
-echo "$ENTRY"

.gitea/workflows/ci.yml

@@ -82,7 +82,10 @@ jobs:
           sed -i "s/^Version:.*/Version:        ${VERSION}/" cortex.spec
 
       - name: Generate changelog entry
-        run: bash .gitea/scripts/generate-rpm-changelog.sh cortex.spec "${{ steps.version.outputs.VERSION }}"
+        uses: https://git.lair.cafe/actions/rpm-changelog@v1
+        with:
+          spec: cortex.spec
+          version: ${{ steps.version.outputs.VERSION }}
 
       - name: Generate source tarball
         run: |
@@ -139,7 +142,10 @@ jobs:
           sed -i "s/^Version:.*/Version:        ${VERSION}/" neuron.spec
 
       - name: Generate changelog entry
-        run: bash .gitea/scripts/generate-rpm-changelog.sh neuron.spec "${{ steps.version.outputs.VERSION }}"
+        uses: https://git.lair.cafe/actions/rpm-changelog@v1
+        with:
+          spec: neuron.spec
+          version: ${{ steps.version.outputs.VERSION }}
 
       - name: Generate source tarball
         run: |