Add github action to build and publish docker image

Resolves #37.

.dockerignore

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+target/
+.git/config

.github/workflows/docker.yml

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+# Copyright 2023 The SeamDB Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: docker
+on:
+  push:
+    branches:
+      - docker
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to Docker Hub
+        if: github.event_name == 'push' && vars.DOCKERHUB_USERNAME
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Generate tag for version
+        id: generate-tag
+        if: github.event_name == 'push' && github.ref_type == 'tag'
+        run: echo "VERSION_TAG=,${{ vars.DOCKERHUB_USERNAME }}/seamdb:$GITHUB_REF_NAME" >> $GITHUB_OUTPUT
+      - name: Test push
+        run: echo "${{ github.event_name == 'push' && vars.DOCKERHUB_USERNAME != '' }}"
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: ${{ github.event_name == 'push' && vars.DOCKERHUB_USERNAME != '' }}
+          tags: ${{ vars.DOCKERHUB_USERNAME || 'unamed' }}/seamdb:latest${{ steps.generate-tag.outputs.VERSION_TAG }}

Dockerfile

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+# Copyright 2023 The SeamDB Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM rust:1-bookworm AS build
+
+RUN apt update && apt install -y cmake protobuf-compiler clang wget
+
+ENV ETCD_VERSION=v3.5.17
+
+RUN wget https://github.com/etcd-io/etcd/releases/download/$ETCD_VERSION/etcd-$ETCD_VERSION-linux-amd64.tar.gz && \
+    mkdir /opt/etcd && \
+    tar xvf etcd-$ETCD_VERSION-linux-amd64.tar.gz --strip-components 1 --directory=/opt/etcd
+
+RUN wget https://dlcdn.apache.org/kafka/3.9.0/kafka_2.13-3.9.0.tgz && \
+    mkdir /opt/kafka && \
+    tar xvf kafka_2.13-3.9.0.tgz --strip-components 1 --directory=/opt/kafka
+
+COPY . seamdb
+
+RUN make -C seamdb release
+
+
+# Final image here
+FROM debian:bookworm
+
+RUN apt update && apt install -y openjdk-17-jdk wget lsof
+
+COPY --from=build /opt/etcd /opt/etcd
+COPY --from=build /opt/kafka /opt/kafka
+COPY --from=build /seamdb/target/release/seamdbd /usr/bin/
+
+ENV PATH=/opt/kafka/bin:/opt/etcd:$PATH
+
+# https://kafka.apache.org/quickstart
+RUN kafka-storage.sh format --standalone -t `kafka-storage.sh random-uuid` -c /opt/kafka/config/kraft/reconfig-server.properties
+
+ENV RUST_BACKTRACE=1 RUST_LOG=seamdb=trace
+
+RUN rm -rf entrypoint.sh && \
+    echo "kafka-server-start.sh /opt/kafka/config/kraft/reconfig-server.properties >> /var/log/kafka.log 2>&1 &" >> entrypoint.sh && \
+    echo "" >> entrypoint.sh && \
+    echo "etcd >> /var/log/etcd.log 2>&1 &" >> entrypoint.sh && \
+    echo "" >> entrypoint.sh && \
+    echo "until lsof -i :2379 > /dev/null" >> entrypoint.sh && \
+    echo "do" >> entrypoint.sh && \
+    echo "  echo waiting etcd up" >> entrypoint.sh && \
+    echo "  sleep 1" >> entrypoint.sh && \
+    echo "done" >> entrypoint.sh && \
+    echo "" >> entrypoint.sh && \
+    echo "until lsof -i :9092 > /dev/null" >> entrypoint.sh && \
+    echo "do" >> entrypoint.sh && \
+    echo "  echo waiting kafka up" >> entrypoint.sh && \
+    echo "  sleep 1" >> entrypoint.sh && \
+    echo "done" >> entrypoint.sh && \
+    echo "" >> entrypoint.sh && \
+    echo "seamdbd --cluster.uri etcd://127.0.0.1:2379/seamdb1 --log.uri kafka://127.0.0.1:9092" >> entrypoint.sh && \
+    chmod u+x entrypoint.sh
+
+EXPOSE 5432
+
+CMD ./entrypoint.sh