Refactor pipeline to use Drone CI

This commit renames the configuration file from .woodpecker.yml to .drone.yml and refactors the pipeline to use Drone CI. The build step now uses thegeeklab/drone-docker-buildx image with privileged access, and sets registry, repo, tags, build_args, username and password settings.

.drone.yml

@@ -1,15 +1,12 @@
-matrix:
-  os:
-    - alpine
-    - slim
-  version:
-    - 16
-    - 18
-    - 20
-platform: linux/amd64
-pipeline:
-  build:
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: build
     image: thegeeklab/drone-docker-buildx
+    privileged: true
     settings:
       registry: techio.dev
       repo: techio.dev/${CI_REPO}
@@ -17,9 +14,12 @@ pipeline:
         - linux/amd64
         - linux/arm64
       tags:
-        - ${version}-${os}
+        - 18-alpine
+        - alpine
+        - 18
+        - latest
       build_args:
-        - tag=${version}-${os}
+        - tag=18-alpine
       username: deploy
       password:
         from_secret: deploy_password