Add Woodpecker CI pipeline, make Dockerfile multi-stage

- Multi-stage Dockerfile: download Zig 0.15.2, build inside Docker
- .woodpecker/deploy.yml: Kaniko build + push + manifest update

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.woodpecker/deploy.yml

@@ -0,0 +1,33 @@
+when:
+  - branch: main
+    event: push
+    path:
+      exclude:
+        - 'k8s/**'
+      on_empty: true
+
+steps:
+  - name: build-and-push
+    image: woodpeckerci/plugin-kaniko
+    settings:
+      registry: git.mikhailkilin.ru
+      repo: killingdruid/transcribator
+      tags: ${CI_COMMIT_SHA}
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+
+  - name: update-manifests
+    image: alpine/git
+    environment:
+      GIT_TOKEN:
+        from_secret: git_push_token
+    commands:
+      - 'printf "machine git.mikhailkilin.ru\nlogin killingdruid\npassword %s\n" "$GIT_TOKEN" > ~/.netrc'
+      - 'chmod 600 ~/.netrc'
+      - 'sed -i "s#image: git.mikhailkilin.ru/killingdruid/transcribator:.*#image: git.mikhailkilin.ru/killingdruid/transcribator:${CI_COMMIT_SHA}#" k8s/transcribator.yaml'
+      - 'git config user.email "woodpecker@ci"'
+      - 'git config user.name "Woodpecker CI"'
+      - 'git add k8s/transcribator.yaml'
+      - 'git diff --cached --quiet && echo "No changes" || (git commit -m "[CI SKIP] deploy ${CI_COMMIT_SHA}" && git push origin HEAD:main)'

Dockerfile

@@ -1,4 +1,12 @@
+FROM alpine:3.21 AS builder
+RUN apk add --no-cache curl xz
+WORKDIR /zig
+RUN curl -fsSL https://ziglang.org/download/0.15.2/zig-x86_64-linux-0.15.2.tar.xz | tar xJ --strip-components=1
+WORKDIR /app
+COPY . .
+RUN /zig/zig build -Doptimize=ReleaseSafe
+
 FROM alpine:3.21
 RUN apk add --no-cache ffmpeg curl ca-certificates
-COPY zig-out/bin/transcribator /usr/local/bin/
+COPY --from=builder /app/zig-out/bin/transcribator /usr/local/bin/
 CMD ["transcribator"]