[ci] Add Woodpecker build pushing to forgejo.viktorbarzin.me/viktor/wealthfolio-sync

Companion to the existing GHA pipeline that pushes broker-sync to
DockerHub. The Woodpecker build pushes to Forgejo as wealthfolio-sync
(image name kept to match the existing infra/stacks/wealthfolio/main.tf
CronJob reference, which has been broken since registry-private lost
the image).

.woodpecker/build.yml

@@ -0,0 +1,45 @@
+when:
+  event: push
+  branch: [main, master]
+
+clone:
+  git:
+    image: woodpeckerci/plugin-git
+    settings:
+      attempts: 5
+      backoff: 10s
+
+steps:
+  - name: lint-and-test
+    image: python:3.12-slim
+    commands:
+      - pip install --no-cache-dir "poetry==1.8.4"
+      - poetry install --no-interaction --no-root
+      - poetry run ruff check .
+      - poetry run mypy broker_sync tests
+      - poetry run pytest -q
+
+  - name: build-and-push
+    image: woodpeckerci/plugin-docker-buildx
+    depends_on:
+      - lint-and-test
+    settings:
+      # Image name is `wealthfolio-sync` to match the deployment in
+      # infra/stacks/wealthfolio/main.tf (CronJob `wealthfolio-sync`).
+      # The repo is called `broker-sync` because the source covers
+      # multiple brokers (Trading 212, Schwab, Fidelity, IMAP-CSV) —
+      # we just happen to publish it under the wealthfolio name since
+      # that's the consumer stack.
+      repo:
+        - forgejo.viktorbarzin.me/viktor/wealthfolio-sync
+      logins:
+        - registry: forgejo.viktorbarzin.me
+          username:
+            from_secret: forgejo_user
+          password:
+            from_secret: forgejo_push_token
+      dockerfile: Dockerfile
+      context: .
+      auto_tag: true
+      platforms:
+        - linux/amd64