fix: surface release API errors in woodpecker pipeline (#5)

Capture and print the full Gitea API response before parsing the release
ID, and fail explicitly if the ID is empty so the root cause is visible
in CI logs instead of silently producing a malformed asset upload URL.

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

Reviewed-on: #5

.woodpecker/release.yaml

@@ -15,17 +15,30 @@ steps:
     depends_on: [test]
 
   - name: release
-    image: alpine/curl
+    image: git.unkin.net/unkin/almalinux9-base:20260325
     environment:
       DRONECI_PASSWORD:
         from_secret: DRONECI_PASSWORD
     commands:
       - |
-        RELEASE_ID=$(curl -sf -X POST "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases" \
+        PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
+        if [ -n "$PREV_TAG" ]; then
+          NOTES=$(git log "${PREV_TAG}..${CI_COMMIT_TAG}" --merges --pretty=format:"- %s")
+        else
+          NOTES=$(git log --merges --pretty=format:"- %s")
+        fi
+        BODY=$(printf '%s' "$NOTES" | sed 's/"/\\"/g; s/$/\\n/' | tr -d '\n')
+        RELEASE_RESPONSE=$(curl -sf -X POST "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases" \
           -u "droneci:$DRONECI_PASSWORD" \
           -H "Content-Type: application/json" \
-          -d "{\"tag_name\":\"${CI_COMMIT_TAG}\",\"name\":\"${CI_COMMIT_TAG}\"}" \
+          -d "{\"tag_name\":\"${CI_COMMIT_TAG}\",\"name\":\"${CI_COMMIT_TAG}\",\"body\":\"${BODY}\"}")
-          | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2)
+        echo "Release API response: ${RELEASE_RESPONSE}"
+        RELEASE_ID=$(echo "${RELEASE_RESPONSE}" | grep -o '"id":[0-9]*' | head -1 | cut -d: -f2)
+        if [ -z "$RELEASE_ID" ]; then
+          echo "ERROR: failed to obtain release ID" >&2
+          exit 1
+        fi
+        echo "Release ID: ${RELEASE_ID}"
         curl -sf -X POST "https://git.unkin.net/api/v1/repos/${CI_REPO}/releases/${RELEASE_ID}/assets" \
           -u "droneci:$DRONECI_PASSWORD" \
           -F "attachment=@node-lookup"