Add Woodpecker dual-push pipeline

.woodpecker.yml

@@ -0,0 +1,36 @@
+when:
+  event: push
+
+clone:
+  git:
+    image: woodpeckerci/plugin-git
+    settings:
+      attempts: 5
+      backoff: 10s
+
+steps:
+  - name: build-and-push
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      # Dual-push during the Forgejo registry consolidation bake. After
+      # ≥14 days clean, registry.viktorbarzin.me drops out (Phase 4).
+      # Upstream github.com/superthunder-afk/Freedify is gone (404) — we
+      # treat this directory as our own code now.
+      repo:
+        - registry.viktorbarzin.me/freedify
+        - forgejo.viktorbarzin.me/viktor/freedify
+      logins:
+        - registry: registry.viktorbarzin.me
+          username: viktorbarzin
+          password:
+            from_secret: registry-password
+        - registry: forgejo.viktorbarzin.me
+          username:
+            from_secret: forgejo_user
+          password:
+            from_secret: forgejo_push_token
+      dockerfile: Dockerfile
+      context: .
+      auto_tag: true
+      platforms:
+        - linux/amd64