Migrate from Drone CI to Woodpecker CI

Replace .drone.yml with .woodpecker.yaml using official
woodpeckerci/plugin-kaniko image. Update base image to Alpine 3.22.2.

.woodpecker.yaml

@@ -11,7 +11,6 @@ steps:
       tags:
         - ${CI_COMMIT_SHA:0:7}
         - ${CI_COMMIT_BRANCH}
-        - ${{ CI_COMMIT_BRANCH == 'main' && 'latest' || CI_COMMIT_BRANCH }}
       cache: true
       username:
         from_secret: harbor_library_username

Dockerfile

@@ -1,4 +1,4 @@
-FROM harbor.ntppool.org/perlorg/base-os:3.23.3
+FROM harbor.ntppool.org/perlorg/base-os:3.22.2
 ENV BUILD_VERSION 1
 USER root
 WORKDIR /web