Add woodpecker CI

.woodpecker/.build.yml

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+steps:
+  dry-run:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: ${CI_REPO_OWNER/redpencilio/redpencil}/${CI_REPO_NAME}
+      platforms: linux/amd64
+      dry-run: true
+      purge: true
+when:
+  - event: pull_request

.woodpecker/.feature.yml

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+steps:
+  push-feature-build:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: ${CI_REPO_OWNER/redpencilio/redpencil}/${CI_REPO_NAME}
+      tags: ${CI_COMMIT_BRANCH/\//-}
+      platforms: linux/amd64
+      purge: true
+    secrets: [ docker_username, docker_password ]
+when:
+  # all events except pull_request
+  - event: [push, pull_request_closed, tag, release, deployment, cron, manual]
+    branch: feature/*

.woodpecker/.latest.yml

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+steps:
+  build-and-push:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: ${CI_REPO_OWNER/redpencilio/redpencil}/${CI_REPO_NAME}
+      tags: latest
+      platforms: linux/amd64
+      purge: true
+    secrets: [ docker_username, docker_password ]
+when:
+  # all events except pull_request
+  - event: [push, pull_request_closed, tag, release, deployment, cron, manual]
+    branch: master

.woodpecker/.release.yml

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+steps:
+  build-and-push-tag:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: ${CI_REPO_OWNER/redpencilio/redpencil}/${CI_REPO_NAME}
+      tags: ${CI_COMMIT_TAG##v}
+      platforms: linux/amd64
+      purge: true
+    secrets: [ docker_username, docker_password ]
+when:
+  - event: tag