feat: add CD pipeline (Dockerfile, .dockerignore, cd.yml)

BuildKit → OCI tar → skopeo push to Gitea registry → infra repo
image tag patch → Flux reconciles new pod on koala.

.dockerignore

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+.git
+.gitea
+.worktrees
+.DS_Store
+*.log
+.env*
+.vscode
+.idea
+bin/
+brain/

.gitea/workflows/cd.yml

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+name: cd
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  deploy:
+    name: Build and deploy
+    needs: [check]
+    runs-on: self-hosted
+    env:
+      SERVICE: supervisor
+      IMAGE: gitea.d-ma.be/mathias/supervisor
+      INFRA_REPO: git@gitea.d-ma.be:mathias/infra.git
+      BUILDKIT_HOST: unix:///run/buildkit/buildkitd.sock
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build and push image
+        run: |
+          set -e
+          trap 'rm -f /tmp/supervisor-image.tar' EXIT
+          IMAGE_TAG="${{ github.sha }}"
+          echo "Building ${IMAGE}:${IMAGE_TAG}"
+
+          # Build to local OCI tar (no registry auth needed at build time)
+          buildctl --addr "${BUILDKIT_HOST}" build \
+            --frontend dockerfile.v0 \
+            --local context=. \
+            --local dockerfile=. \
+            --opt build-arg:VERSION="${IMAGE_TAG}" \
+            --output type=oci,dest=/tmp/supervisor-image.tar
+
+          # Push with skopeo using simple credential flag (avoids OAuth token flow)
+          skopeo copy \
+            oci-archive:/tmp/supervisor-image.tar \
+            docker://${IMAGE}:${IMAGE_TAG} \
+            --dest-creds "${{ secrets.REGISTRY_CREDS }}"
+
+          echo "Built and pushed ${IMAGE}:${IMAGE_TAG}"
+
+      - name: Update infra repo
+        run: |
+          set -e
+          trap 'rm -rf /tmp/infra-update; rm -f ~/.ssh/infra_deploy_key' EXIT
+          IMAGE_TAG="${{ github.sha }}"
+          mkdir -p ~/.ssh
+          echo "${{ secrets.INFRA_DEPLOY_KEY }}" > ~/.ssh/infra_deploy_key
+          chmod 600 ~/.ssh/infra_deploy_key
+          ssh-keyscan gitea.d-ma.be >> ~/.ssh/known_hosts 2>/dev/null
+
+          GIT_SSH_COMMAND="ssh -i ~/.ssh/infra_deploy_key -o IdentitiesOnly=yes" \
+            git clone "${INFRA_REPO}" /tmp/infra-update
+
+          cd /tmp/infra-update
+          sed -i "s|gitea.d-ma.be/mathias/supervisor:.*|gitea.d-ma.be/mathias/supervisor:${IMAGE_TAG}|" \
+            "k3s/apps/${SERVICE}/deployment.yaml"
+
+          git config user.email "cd-bot@d-ma.be"
+          git config user.name "CD Bot"
+          git add "k3s/apps/${SERVICE}/deployment.yaml"
+          git commit -m "chore(deploy): ${SERVICE} → ${IMAGE_TAG}"
+          GIT_SSH_COMMAND="ssh -i ~/.ssh/infra_deploy_key -o IdentitiesOnly=yes" \
+            git push
+
+          echo "Infra repo updated: ${SERVICE} → ${IMAGE_TAG}"

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# ── Build stage ───────────────────────────────────────────────────────────────
+FROM golang:1.26-bookworm AS builder
+
+ARG VERSION=dev
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 \
+    go build -trimpath -ldflags="-s -w -X main.version=${VERSION}" \
+    -o /out/supervisor ./cmd/supervisor
+
+# ── Runtime stage ─────────────────────────────────────────────────────────────
+# Node.js 22 slim — needed for claude CLI subprocess
+FROM node:22-slim
+
+# Install claude CLI (provides the `claude` binary the supervisor shells out to)
+RUN npm install -g @anthropic-ai/claude-code \
+    && claude --version \
+    && echo "claude CLI installed"
+
+# Copy supervisor binary
+COPY --from=builder /out/supervisor /usr/local/bin/supervisor
+
+# Bake in config (models.yaml + skill discipline files)
+COPY config/ /app/config/
+
+# Run as non-root
+RUN groupadd -r supervisor && useradd -r -g supervisor -d /app supervisor
+
+WORKDIR /app
+
+# brain/ is writable state — mount a PersistentVolume here
+VOLUME /app/brain
+
+ENV SUPERVISOR_CONFIG_DIR=/app/config/supervisor
+ENV SUPERVISOR_MODELS_FILE=/app/config/models.yaml
+ENV SUPERVISOR_BRAIN_DIR=/app/brain
+ENV SUPERVISOR_SESSIONS_DIR=/app/brain/sessions
+ENV SUPERVISOR_PORT=3200
+
+USER supervisor
+
+EXPOSE 3200
+
+ENTRYPOINT ["/usr/local/bin/supervisor"]