Add woodpecker CI

.woodpecker.yml

@@ -0,0 +1,25 @@
+---
+platform: linux/arm64
+
+pipeline:
+  build:
+    image: golang
+    environment:
+      - GOOS=linux
+      - GOARCH=amd64
+    commands:
+      - go build .
+
+  docker:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      platforms: linux/amd64
+      registry: git.freifunk-rhein-sieg.net
+      repo: git.freifunk-rhein-sieg.net/freifunk-troisdorf/ubnt-freifunk-map-api
+      username:
+        from_secret: gitea_user
+      password:
+        from_secret: gitea_token
+      tags: ${CI_COMMIT_TAG}
+    when:
+      - branch: master