build(ci): migrate from Drone to Woodpecker

Replace .drone.yml with .woodpecker.yaml and update
scripts/run-goreleaser to use CI_COMMIT_TAG instead
of DRONE_TAG.

.drone.yml

@@ -1,88 +0,0 @@
----
-kind: pipeline
-type: kubernetes
-name: default
-
-environment:
-  GOCACHE: /cache/pkg/cache
-  GOMODCACHE: /cache/pkg/mod
-
-steps:
-  - name: fetch-tags
-    image: alpine/git
-    commands:
-      - git fetch --tags
-    resources:
-      requests:
-        cpu: 250
-        memory: 50MiB
-      limits:
-        cpu: 250
-        memory: 100MiB
-
-  - name: test
-    image: golang:1.26
-    pull: always
-    volumes:
-      - name: go
-        path: /go
-      - name: gopkg
-        path: /cache
-    commands:
-      - go test -v ./...
-      - go build ./...
-
-  - name: goreleaser
-    image: golang:1.26
-    pull: always
-    resources:
-      requests:
-        cpu: 6000
-        memory: 1024MiB
-      limits:
-        cpu: 10000
-        memory: 4096MiB
-    volumes:
-      - name: go
-        path: /go
-      - name: gopkg
-        path: /cache
-    environment:
-    #  GITHUB_TOKEN:
-    #    from_secret: GITHUB_TOKEN
-    commands:
-      - ./scripts/run-goreleaser
-    depends_on: [test]
-
-  - name: docker
-    image: harbor.ntppool.org/ntppool/drone-kaniko:main
-    pull: always
-    volumes:
-      - name: go
-        path: /go
-      - name: gopkg
-        path: /cache
-    settings:
-      repo: ntppool/data-api
-      registry: harbor.ntppool.org
-      auto_tag: true
-      tags: SHA7,${DRONE_SOURCE_BRANCH}
-      cache: true
-      username:
-        from_secret: harbor_username
-      password:
-        from_secret: harbor_password
-    depends_on: [goreleaser]
-
-volumes:
-  - name: go
-    temp: {}
-  - name: gopkg
-    claim:
-      name: go-pkg
-
----
-kind: signature
-hmac: f78b7702ee701ed5d31d772e0423fe4583929d623a98520078fb5aa5a536c0ec
-
-...

.woodpecker.yaml

@@ -0,0 +1,69 @@
+when:
+  - event: [push, pull_request, tag, manual]
+
+clone:
+  git:
+    image: woodpeckerci/plugin-git
+    settings:
+      tags: true
+
+variables:
+  - &go_env
+    GOMODCACHE: /go/pkg/mod
+    GOCACHE: /go/pkg/cache
+  - &go_volumes
+    - go-pkg:/go/pkg
+
+steps:
+  - name: test
+    image: golang:1.26
+    pull: true
+    environment: *go_env
+    volumes: *go_volumes
+    commands:
+      - go test -v ./...
+      - go build ./...
+
+  - name: goreleaser
+    image: golang:1.26
+    pull: true
+    environment: *go_env
+    volumes: *go_volumes
+    commands:
+      - ./scripts/run-goreleaser
+    backend_options:
+      kubernetes:
+        resources:
+          requests:
+            cpu: 6000
+            memory: 1024Mi
+          limits:
+            cpu: 10000
+            memory: 4096Mi
+    depends_on: [test]
+
+  - name: generate-tags
+    image: ghcr.io/abh/woodpecker-docker-tags-plugin:sha-8a3bd7c
+    settings:
+      tags: |
+        branch
+        sha
+        semver --auto
+        edge -v latest
+    when:
+      - event: [push, tag, manual]
+    depends_on: [goreleaser]
+
+  - name: docker
+    image: woodpeckerci/plugin-kaniko
+    settings:
+      registry: harbor.ntppool.org
+      repo: ntppool/data-api
+      cache: true
+      username:
+        from_secret: harbor_username
+      password:
+        from_secret: harbor_password
+    when:
+      - event: [push, tag, manual]
+    depends_on: [goreleaser, generate-tags]

scripts/run-goreleaser

@@ -2,7 +2,7 @@
 
 set -euo pipefail
 
-go install github.com/goreleaser/goreleaser/v2@v2.12.3
+go install github.com/goreleaser/goreleaser/v2@v2.13.3
 
 if [ ! -z "${harbor_username:-}" ]; then
   DOCKER_FILE=~/.docker/config.json
@@ -13,11 +13,11 @@ if [ ! -z "${harbor_username:-}" ]; then
   fi
 fi
 
-DRONE_TAG=${DRONE_TAG-""}
+CI_TAG=${CI_COMMIT_TAG:-${DRONE_TAG:-""}}
 
 is_snapshot=""
 
-if [ -z "$DRONE_TAG" ]; then
+if [ -z "$CI_TAG" ]; then
   is_snapshot="--snapshot"
 fi